[sign_in]: Bump com.google.android.gms:play-services-auth from 20.5.0…

… to 20.6.0 in /packages/google_sign_in/google_sign_in_android/android (#4359)

Bumps com.google.android.gms:play-services-auth from 20.5.0 to 20.6.0.

[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=com.google.android.gms:play-services-auth&package-manager=gradle&previous-version=20.5.0&new-version=20.6.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

</details>

packages/google_sign_in/google_sign_in_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 6.1.18
+
+* Updates play-services-auth version to 20.6.0.
+
 ## 6.1.17
 
 * Converts method channels to Pigeon.

packages/google_sign_in/google_sign_in_android/android/build.gradle

@@ -59,7 +59,7 @@ android {
 }
 
 dependencies {
-    implementation 'com.google.android.gms:play-services-auth:20.5.0'
+    implementation 'com.google.android.gms:play-services-auth:20.6.0'
     implementation 'com.google.guava:guava:32.0.1-android'
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.mockito:mockito-inline:5.0.0'

packages/google_sign_in/google_sign_in_android/pubspec.yaml

@@ -2,7 +2,7 @@ name: google_sign_in_android
 description: Android implementation of the google_sign_in plugin.
 repository: https://github.com/flutter/packages/tree/main/packages/google_sign_in/google_sign_in_android
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+google_sign_in%22
-version: 6.1.17
+version: 6.1.18
 
 environment:
   sdk: ">=2.18.0 <4.0.0"