chore: update min version to Go 1.19 (#8610)

.github/renovate.json

@@ -12,8 +12,7 @@
     "commitMessageAction": "update",
     "groupName": "deps",
     "ignoreDeps": [
-        "google.golang.org/genproto",
-        "google.golang.org/grpc"
+        "google.golang.org/genproto"
     ],
     "ignorePaths": [
         "**/snippets/**"
@@ -23,4 +22,4 @@
             "go": "1.20"
         }
     }
-}
+}

README.md

@@ -10,17 +10,13 @@ import "cloud.google.com/go"
 
 To install the packages on your system, *do not clone the repo*. Instead:
 
-1. Change to your project directory:
-
-   ```bash
-   cd /my/cloud/project
-   ```
+1. Change to your project directory: `cd /my/cloud/project`
 1. Get the package you want to use. Some products have their own module, so it's
    best to `go get` the package(s) you want to use:
 
-   ```
-   $ go get cloud.google.com/go/firestore # Replace with the package you want to use.
-   ```
+```bash
+go get cloud.google.com/go/firestore # Replace with the package you want to use.
+```
 
 **NOTE:** Some of these packages are under development, and may occasionally
 make backwards-incompatible changes.
@@ -35,18 +31,16 @@ For an updated list of all of our released APIs please see our
 Our libraries are compatible with at least the three most recent, major Go
 releases. They are currently compatible with:
 
+- Go 1.21
 - Go 1.20
 - Go 1.19
-- Go 1.18
-- Go 1.17
 
 ## Authorization
 
 By default, each API will use [Google Application Default Credentials](https://developers.google.com/identity/protocols/application-default-credentials)
 for authorization credentials used in calling the API endpoints. This will allow your
 application to run in many environments without requiring explicit configuration.
 
-[snip]:# (auth)
 ```go
 client, err := storage.NewClient(ctx)
 ```
@@ -57,7 +51,6 @@ pass
 [`option.WithCredentialsFile`](https://pkg.go.dev/google.golang.org/api/option#WithCredentialsFile)
 to the `NewClient` function of the desired package. For example:
 
-[snip]:# (auth-JSON)
 ```go
 client, err := storage.NewClient(ctx, option.WithCredentialsFile("path/to/keyfile.json"))
 ```
@@ -67,7 +60,7 @@ You can exert more control over authorization by using the
 create an `oauth2.TokenSource`. Then pass
 [`option.WithTokenSource`](https://pkg.go.dev/google.golang.org/api/option#WithTokenSource)
 to the `NewClient` function:
-[snip]:# (auth-ts)
+
 ```go
 tokenSource := ...
 client, err := storage.NewClient(ctx, option.WithTokenSource(tokenSource))
@@ -84,51 +77,6 @@ By participating in this project you agree to abide by its terms.
 See [Contributor Code of Conduct](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/main/CONTRIBUTING.md#contributor-code-of-conduct)
 for more information.
 
-[cloud-asset]: https://cloud.google.com/security-command-center/docs/how-to-asset-inventory
-[cloud-automl]: https://cloud.google.com/automl
-[cloud-build]: https://cloud.google.com/cloud-build/
-[cloud-bigquery]: https://cloud.google.com/bigquery/
-[cloud-bigtable]: https://cloud.google.com/bigtable/
-[cloud-compute]: https://cloud.google.com/compute
-[cloud-container]: https://cloud.google.com/containers/
-[cloud-containeranalysis]: https://cloud.google.com/container-registry/docs/container-analysis
-[cloud-dataproc]: https://cloud.google.com/dataproc/
-[cloud-datastore]: https://cloud.google.com/datastore/
-[cloud-dialogflow]: https://cloud.google.com/dialogflow-enterprise/
-[cloud-debugger]: https://cloud.google.com/debugger/
-[cloud-dlp]: https://cloud.google.com/dlp/
-[cloud-errors]: https://cloud.google.com/error-reporting/
-[cloud-firestore]: https://cloud.google.com/firestore/
-[cloud-iam]: https://cloud.google.com/iam/
-[cloud-iot]: https://cloud.google.com/iot-core/
-[cloud-irm]: https://cloud.google.com/incident-response/docs/concepts
-[cloud-kms]: https://cloud.google.com/kms/
-[cloud-pubsub]: https://cloud.google.com/pubsub/
-[cloud-pubsublite]: https://cloud.google.com/pubsub/lite
-[cloud-storage]: https://cloud.google.com/storage/
-[cloud-language]: https://cloud.google.com/natural-language
-[cloud-logging]: https://cloud.google.com/logging/
-[cloud-natural-language]: https://cloud.google.com/natural-language/
-[cloud-memorystore]: https://cloud.google.com/memorystore/
-[cloud-monitoring]: https://cloud.google.com/monitoring/
-[cloud-oslogin]: https://cloud.google.com/compute/docs/oslogin/rest
-[cloud-phishingprotection]: https://cloud.google.com/phishing-protection/
-[cloud-securitycenter]: https://cloud.google.com/security-command-center/
-[cloud-scheduler]: https://cloud.google.com/scheduler
-[cloud-spanner]: https://cloud.google.com/spanner/
-[cloud-speech]: https://cloud.google.com/speech
-[cloud-talent]: https://cloud.google.com/solutions/talent-solution/
-[cloud-tasks]: https://cloud.google.com/tasks/
-[cloud-texttospeech]: https://cloud.google.com/texttospeech/
-[cloud-talent]: https://cloud.google.com/solutions/talent-solution/
-[cloud-trace]: https://cloud.google.com/trace/
-[cloud-translate]: https://cloud.google.com/translate
-[cloud-recaptcha]: https://cloud.google.com/recaptcha-enterprise/
-[cloud-recommender]: https://cloud.google.com/recommendations/
-[cloud-video]: https://cloud.google.com/video-intelligence/
-[cloud-vision]: https://cloud.google.com/vision
-[cloud-webrisk]: https://cloud.google.com/web-risk/
-
 ## Links
 
 - [Go on Google Cloud](https://cloud.google.com/go/home)