Bump com.nimbusds:oauth2-oidc-sdk from 11.13 to 11.21.2

Bumps [com.nimbusds:oauth2-oidc-sdk](https://bitbucket.org/connect2id/oauth-2.0-sdk-with-openid-connect-extensions) from 11.13 to 11.21.2.
- [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/11.21.2..11.13)

---
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]>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -17,7 +17,7 @@ jcipAnnotationsVersion = "1.0_2"
 # Once Javalin version is upgraded to the latest, this override may be removed.
 jettyVersion = "11.0.21"
 micrometerVersion = "1.12.4"
-nimbusVersion = "11.13"
+nimbusVersion = "11.21.2"
 kafkaClientVersion = "3.7.0_1"
 kubernetesClientVersion = "6.13.1"
 log4jVersion = "2.23.0"