Bump org.openapi.generator in /generators/server/resources

Bumps org.openapi.generator from 7.5.0 to 7.7.0.

---
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>

generators/server/resources/gradle/libs.versions.toml

@@ -35,4 +35,4 @@ common-custom-user-data-gradle-plugin = { id = 'com.gradle.common-custom-user-da
 
 gatling-gradle = { id = 'io.gatling.gradle', version = '3.11.5.2' }
 
-gradle-openapi-generator = { id = 'org.openapi.generator', version = '7.5.0' }
+gradle-openapi-generator = { id = 'org.openapi.generator', version = '7.7.0' }