build(deps): update dependency com.google.cloud:google-cloud-shared-c…

…onfig to v1.2.6 (#980)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-shared-config](https://togithub.com/googleapis/java-shared-config) | `1.2.5` -> `1.2.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-config/1.2.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-config/1.2.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-config/1.2.6/compatibility-slim/1.2.5)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-config/1.2.6/confidence-slim/1.2.5)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-shared-config</summary>

### [`v1.2.6`](https://togithub.com/googleapis/java-shared-config/blob/HEAD/CHANGELOG.md#&#8203;126-httpsgithubcomgoogleapisjava-shared-configcomparev125v126-2022-01-19)

[Compare Source](https://togithub.com/googleapis/java-shared-config/compare/v1.2.5...v1.2.6)

</details>

---

### Configuration

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.github/CODEOWNERS

@@ -9,4 +9,4 @@
 **/*.java               @googleapis/api-pubsub
 
 # The java-samples-reviewers team is the default owner for samples changes
-samples/**/*.java       @googleapis/java-samples-reviewers @GoogleCloudPlatform/api-pubsub-and-pubsublite
+samples/**/*.java       @googleapis/java-samples-reviewers

google-cloud-pubsub-bom/pom.xml

@@ -8,7 +8,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>1.2.5</version>
+    <version>1.2.6</version>
   </parent>
 
   <name>Google Cloud pubsub BOM</name>

pom.xml

@@ -14,7 +14,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>1.2.5</version>
+    <version>1.2.6</version>
   </parent>
 
   <developers>