build(deps): bump org.openapi.generator from 7.5.0 to 7.8.0

Bumps org.openapi.generator from 7.5.0 to 7.8.0.

---
updated-dependencies:
- dependency-name: org.openapi.generator
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

gradle/libs.versions.toml

@@ -28,7 +28,7 @@ quarkusPlatform = "2.16.12.Final"
 quarkusPlugin = "2.16.12.Final"
 
 # other
-openapi = "7.5.0"
+openapi = "7.8.0"
 kotlin = "2.0.10"
 antJunit = "1.10.14"
 junit = "4.13.2"