chore(deps): update dependency com.google.api:gax to v2.18.6 (#927)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.api:gax](https://togithub.com/googleapis/gax-java) | `2.18.4` -> `2.18.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api:gax/2.18.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api:gax/2.18.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api:gax/2.18.6/compatibility-slim/2.18.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api:gax/2.18.6/confidence-slim/2.18.4)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v2.18.6`](https://togithub.com/googleapis/gax-java/blob/HEAD/CHANGELOG.md#&#8203;2186-httpsgithubcomgoogleapisgax-javacomparev2185v2186-2022-07-29)

[Compare Source](https://togithub.com/googleapis/gax-java/compare/v2.18.5...v2.18.6)

##### Bug Fixes

-   **deps:** update dependency com.google.cloud:google-cloud-shared-config to v1.5.2 ([#&#8203;1746](https://togithub.com/googleapis/gax-java/issues/1746)) ([8163f8a](https://togithub.com/googleapis/gax-java/commit/8163f8aa822881d8cd6f1f72aca66b50fbd2e66a))
-   **deps:** update dependency com.google.cloud:google-cloud-shared-config to v1.5.3 ([#&#8203;1748](https://togithub.com/googleapis/gax-java/issues/1748)) ([f2b7cb2](https://togithub.com/googleapis/gax-java/commit/f2b7cb2b6b783095547b798da054b6879d3764f1))
-   **deps:** update dependency com.google.protobuf:protobuf-bom to v3.21.4 ([#&#8203;1747](https://togithub.com/googleapis/gax-java/issues/1747)) ([0b2b1ef](https://togithub.com/googleapis/gax-java/commit/0b2b1efcf38ff9f253e426af8c21722d646c8627))
-   Exclude error_prone_annotations from guava. ([#&#8203;1750](https://togithub.com/googleapis/gax-java/issues/1750)) ([e1c91a4](https://togithub.com/googleapis/gax-java/commit/e1c91a40bcf413af5210da1d43e409d44dcf13bd))

### [`v2.18.5`](https://togithub.com/googleapis/gax-java/blob/HEAD/CHANGELOG.md#&#8203;2185-httpsgithubcomgoogleapisgax-javacomparev2184v2185-2022-07-25)

[Compare Source](https://togithub.com/googleapis/gax-java/compare/v2.18.4...v2.18.5)

##### Bug Fixes

-   **deps:** update dependency com.google.api.grpc:grpc-google-common-protos to v2.9.2 ([#&#8203;1735](https://togithub.com/googleapis/gax-java/issues/1735)) ([d7f00be](https://togithub.com/googleapis/gax-java/commit/d7f00beae84c093a732982aaeedd7d6a8752e52c))
-   **deps:** update dependency com.google.api.grpc:proto-google-common-protos to v2.9.2 ([#&#8203;1736](https://togithub.com/googleapis/gax-java/issues/1736)) ([ee3d4ad](https://togithub.com/googleapis/gax-java/commit/ee3d4ad29a84da9113790dd03b8f0bbd89625a7c))
-   **deps:** update dependency com.google.auth:google-auth-library-credentials to v1.8.1 ([#&#8203;1737](https://togithub.com/googleapis/gax-java/issues/1737)) ([24bc629](https://togithub.com/googleapis/gax-java/commit/24bc629aa1ffc0513ba766858935ead7ab18bf9e))
-   **deps:** update dependency com.google.auth:google-auth-library-oauth2-http to v1.8.1 ([#&#8203;1738](https://togithub.com/googleapis/gax-java/issues/1738)) ([1030eb6](https://togithub.com/googleapis/gax-java/commit/1030eb6b1df5008f304d0989fd991f88f148cc2a))
-   **deps:** update dependency com.google.cloud:google-cloud-shared-config to v1.5.1 ([#&#8203;1726](https://togithub.com/googleapis/gax-java/issues/1726)) ([bdffb86](https://togithub.com/googleapis/gax-java/commit/bdffb86c05235c4ad783ab7afd28724386465569))
-   **deps:** update dependency com.google.http-client:google-http-client-bom to v1.42.2 ([#&#8203;1727](https://togithub.com/googleapis/gax-java/issues/1727)) ([030e9b3](https://togithub.com/googleapis/gax-java/commit/030e9b33ec6bd98122fba59a1bc39513444c3511))
-   **deps:** update dependency com.google.protobuf:protobuf-bom to v3.21.3 ([#&#8203;1742](https://togithub.com/googleapis/gax-java/issues/1742)) ([9215e1f](https://togithub.com/googleapis/gax-java/commit/9215e1f58ebcc6eccef42c53981ab90865fe366a))
-   **deps:** update dependency io.grpc:grpc-bom to v1.48.0 ([#&#8203;1741](https://togithub.com/googleapis/gax-java/issues/1741)) ([4735a4b](https://togithub.com/googleapis/gax-java/commit/4735a4b29b686ba510a25ad8458142870e50b1c5))
-   remove initialization of logger classes which is conflicting with slf4j ([#&#8203;1733](https://togithub.com/googleapis/gax-java/issues/1733)) ([ccaf265](https://togithub.com/googleapis/gax-java/commit/ccaf26537a189dacb9b3bb58760a4c6f6cd48a87))

</details>

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Author: renovate-bot

core/pom.xml

@@ -222,7 +222,7 @@
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>gax</artifactId>
-      <version>2.18.4</version>
+      <version>2.18.6</version>
       <exclusions>
         <!-- Native image users only need GAX's native-image metadata. GAX's
         dependencies are unnecessary for normal users and native image users -->