deps: update dependency com.google.api:gax-bom to v2.19.0 (#907)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.api:gax-bom](https://togithub.com/googleapis/gax-java) | `2.18.7` -> `2.19.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api:gax-bom/2.19.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api:gax-bom/2.19.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api:gax-bom/2.19.0/compatibility-slim/2.18.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api:gax-bom/2.19.0/confidence-slim/2.18.7)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/gax-java</summary>

### [`v2.19.0`](https://togithub.com/googleapis/gax-java/blob/HEAD/CHANGELOG.md#&#8203;2190-httpsgithubcomgoogleapisgax-javacomparev2187v2190-2022-08-22)

[Compare Source](https://togithub.com/googleapis/gax-java/compare/v2.18.7...v2.19.0)

##### Features

-   Add numeric enum support. ([#&#8203;1743](https://togithub.com/googleapis/gax-java/issues/1743)) ([3f7628e](https://togithub.com/googleapis/gax-java/commit/3f7628e27495806675ec8c8521e9c33725908936))

##### Bug Fixes

-   **deps:** update dependency com.google.auth:google-auth-library-credentials to v1.10.0 ([#&#8203;1768](https://togithub.com/googleapis/gax-java/issues/1768)) ([3f2188d](https://togithub.com/googleapis/gax-java/commit/3f2188d83751272de1a4c3db85e95d79b690e3fc))
-   **deps:** update dependency com.google.auth:google-auth-library-credentials to v1.9.0 ([#&#8203;1765](https://togithub.com/googleapis/gax-java/issues/1765)) ([103db3c](https://togithub.com/googleapis/gax-java/commit/103db3cc06cfaafeda1a043b6e19e668083ed782))
-   **deps:** update dependency com.google.auth:google-auth-library-oauth2-http to v1.10.0 ([#&#8203;1769](https://togithub.com/googleapis/gax-java/issues/1769)) ([0b1eb92](https://togithub.com/googleapis/gax-java/commit/0b1eb924aefc79b6fc4757d253d4c8a93a094c84))
-   **deps:** update dependency com.google.auth:google-auth-library-oauth2-http to v1.9.0 ([#&#8203;1766](https://togithub.com/googleapis/gax-java/issues/1766)) ([2677f07](https://togithub.com/googleapis/gax-java/commit/2677f07a8e20c82403f60c6aa1f9d46c1274b37f))
-   **deps:** update dependency com.google.code.gson:gson to v2.9.1 ([#&#8203;1757](https://togithub.com/googleapis/gax-java/issues/1757)) ([ea2a075](https://togithub.com/googleapis/gax-java/commit/ea2a07504899703e4fcd428f31d615fb208a50aa))
-   **deps:** update dependency com.google.protobuf:protobuf-bom to v3.21.5 ([#&#8203;1772](https://togithub.com/googleapis/gax-java/issues/1772)) ([d7a48d1](https://togithub.com/googleapis/gax-java/commit/d7a48d1886a3f39acb26580d1d35a288102af436))
-   **deps:** update dependency io.grpc:grpc-bom to v1.48.1 ([#&#8203;1763](https://togithub.com/googleapis/gax-java/issues/1763)) ([e5e4232](https://togithub.com/googleapis/gax-java/commit/e5e423200260c210071ce626612d7e54af0695e4))
-   **deps:** update dependency org.graalvm.sdk:graal-sdk to v22.2.0 ([#&#8203;1740](https://togithub.com/googleapis/gax-java/issues/1740)) ([ded44a6](https://togithub.com/googleapis/gax-java/commit/ded44a66d3de8a2678fa4c5efe8b3ded4484de2b))
-   **deps:** update dependency org.mockito:mockito-core to v4.7.0 ([#&#8203;1774](https://togithub.com/googleapis/gax-java/issues/1774)) ([29678c8](https://togithub.com/googleapis/gax-java/commit/29678c805855c97b4c26f0156923a41820411a10))
-   **deps:** update dependency org.threeten:threetenbp to v1.6.1 ([#&#8203;1773](https://togithub.com/googleapis/gax-java/issues/1773)) ([d2c84e6](https://togithub.com/googleapis/gax-java/commit/d2c84e6fb22a2752b68fecc9b6c9e480f398b87c))
-   **test:** testThrottlingBlocking flakyness fix ([#&#8203;1775](https://togithub.com/googleapis/gax-java/issues/1775)) ([e69393c](https://togithub.com/googleapis/gax-java/commit/e69393c32ffe32306acc8f495b1f41198d86f507))

##### Documentation

-   explaining UNIX environment is required ([#&#8203;1760](https://togithub.com/googleapis/gax-java/issues/1760)) ([1d31e90](https://togithub.com/googleapis/gax-java/commit/1d31e90e70867cb4b896d7a393f9271788b6371f))

</details>

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pom.xml

@@ -151,7 +151,7 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <github.global.server>github</github.global.server>
     <site.installationModule>google-cloud-core-parent</site.installationModule>
-    <gax.version>2.18.7</gax.version>
+    <gax.version>2.19.0</gax.version>
     <google.api-common.version>2.2.1</google.api-common.version>
     <google.common-protos.version>2.9.2</google.common-protos.version>
     <google.iam.version>1.5.2</google.iam.version>