Bump springdoc-openapi-ui from 1.6.12 to 1.6.13

Bumps [springdoc-openapi-ui](https://github.com/springdoc/springdoc-openapi) from 1.6.12 to 1.6.13.
- [Release notes](https://github.com/springdoc/springdoc-openapi/releases)
- [Changelog](https://github.com/springdoc/springdoc-openapi/blob/master/CHANGELOG.md)
- [Commits](springdoc/springdoc-openapi@v1.6.12...v1.6.13)

---
updated-dependencies:
- dependency-name: org.springdoc:springdoc-openapi-ui
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle

@@ -114,7 +114,7 @@ allprojects {
         slf4jVersion = '1.7.36'
         snappyVersion = '1.1.8.4'
         springbootVersion = '2.7.6'
-        springdocVersion = '1.6.12'
+        springdocVersion = '1.6.13'
         spotbugsVersion = '4.7.3'
         springdataVersion = '2.7.6'
         springldapVersion = '2.4.1'