Build(deps): Bump openapitools.version from 6.6.0 to 7.15.0

Bumps `openapitools.version` from 6.6.0 to 7.15.0.

Updates `org.openapitools:openapi-generator` from 6.6.0 to 7.15.0
- [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@v6.6.0...v7.15.0)

Updates `org.openapitools:openapi-generator-maven-plugin` from 6.6.0 to 7.15.0

---
updated-dependencies:
- dependency-name: org.openapitools:openapi-generator
  dependency-version: 7.15.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.openapitools:openapi-generator-maven-plugin
  dependency-version: 7.15.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

basyx.aasregistry/pom.xml

@@ -33,7 +33,7 @@
 		<maven-project.version>3.0-alpha-2</maven-project.version>
 		<mustache.compiler.version>0.9.14</mustache.compiler.version>
 		<docker.image.name>${project.artifactId}</docker.image.name>
-		<openapitools.version>6.6.0</openapitools.version>
+		<openapitools.version>7.15.0</openapitools.version>
 		<openapitools.jacksonnullable.version>0.2.7</openapitools.jacksonnullable.version>
 		<jsr305.version>3.0.2</jsr305.version>
 		<jsonpatch.plugin.version>0.5.1</jsonpatch.plugin.version>

basyx.submodelregistry/pom.xml

@@ -31,7 +31,7 @@
 		<maven-project.version>3.0-alpha-2</maven-project.version>
 		<mustache.compiler.version>0.9.14</mustache.compiler.version>
 		<docker.image.name>${project.artifactId}</docker.image.name>
-		<openapitools.version>6.6.0</openapitools.version>
+		<openapitools.version>7.15.0</openapitools.version>
 		<openapitools.jacksonnullable.version>0.2.7</openapitools.jacksonnullable.version>
 		<jsr305.version>3.0.2</jsr305.version>
 		<jsonpatch.plugin.version>0.5.1</jsonpatch.plugin.version>