Bump org.openapi.generator from 7.3.0 to 7.8.0

Bumps org.openapi.generator from 7.3.0 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] <[email protected]>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ kotlinx-serializationJson = "1.6.3"
 # https://github.com/ktorio/ktor/releases
 ktor = "2.3.12"
 # https://github.com/OpenAPITools/openapi-generator/releases
-openapi-generator = "7.3.0"
+openapi-generator = "7.8.0"
 
 [libraries]
 gradle-develocity = { module = "com.gradle:develocity-gradle-plugin", version.ref = "gradle-develocity" }