Bump com.nimbusds:oauth2-oidc-sdk from 11.20.2 to 11.21

Bumps [com.nimbusds:oauth2-oidc-sdk](https://bitbucket.org/connect2id/oauth-2.0-sdk-with-openid-connect-extensions) from 11.20.2 to 11.21.
- [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..11.20.2)

---
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]>

pom.xml

@@ -54,7 +54,7 @@
         <maven.compiler.target>21</maven.compiler.target>
         <java.version>21</java.version>
         <spring-boot.version>3.4.1</spring-boot.version>
-        <oauth2-oidc-sdk.version>11.20.2</oauth2-oidc-sdk.version>
+        <oauth2-oidc-sdk.version>11.21</oauth2-oidc-sdk.version>
         <validation-api.version>2.0.1.Final</validation-api.version>
         <mockwebserver.version>4.12.0</mockwebserver.version>
         <caffeine.version>3.1.8</caffeine.version>