chore(deps): bump com.nimbusds:oauth2-oidc-sdk from 11.6 to 11.9.1

Bumps [com.nimbusds:oauth2-oidc-sdk](https://bitbucket.org/connect2id/oauth-2.0-sdk-with-openid-connect-extensions) from 11.6 to 11.9.1.
- [Changelog](https://bitbucket.org/connect2id/oauth-2.0-sdk-with-openid-connect-extensions/src/master/CHANGELOG.txt)
- [Commits](https://bitbucket.org/connect2id/oauth-2.0-sdk-with-openid-connect-extensions/branches/compare/11.9.1..11.6)

---
updated-dependencies:
- dependency-name: com.nimbusds:oauth2-oidc-sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle.kts

@@ -4,7 +4,7 @@ import com.github.benmanes.gradle.versions.updates.DependencyUpdatesTask
 val assertjVersion = "3.25.1"
 val kotlinLoggingVersion = "3.0.5"
 val logbackVersion = "1.4.14"
-val nimbusSdkVersion = "11.6"
+val nimbusSdkVersion = "11.9.1"
 val mockWebServerVersion = "4.12.0"
 val jacksonVersion = "2.16.1"
 val nettyVersion = "4.1.104.Final"