Bump openapi-generator.version from 7.4.0 to 7.8.0

Bumps `openapi-generator.version` from 7.4.0 to 7.8.0.

Updates `org.openapitools:openapi-generator` from 7.4.0 to 7.8.0
- [Release notes](https://github.com/openapitools/openapi-generator/releases)
- [Changelog](https://github.com/OpenAPITools/openapi-generator/blob/master/docs/3.0.0-release-note.md)
- [Commits](OpenAPITools/openapi-generator@v7.4.0...v7.8.0)

Updates `org.openapitools:openapi-generator-maven-plugin` from 7.4.0 to 7.8.0

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

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -44,7 +44,7 @@
 
         <sonar.organization>backbase</sonar.organization>
         <sonar.host.url>https://sonarcloud.io</sonar.host.url>
-        <openapi-generator.version>7.4.0</openapi-generator.version>
+        <openapi-generator.version>7.8.0</openapi-generator.version>
         <aggregate.report.dir>tests/target/site/jacoco-aggregate/jacoco.xml</aggregate.report.dir>
         <sonar.coverage.jacoco.xmlReportPaths>${aggregate.report.dir}</sonar.coverage.jacoco.xmlReportPaths>