Bump openapi-generator-maven-plugin from 6.5.0 to 6.6.0

Bumps openapi-generator-maven-plugin from 6.5.0 to 6.6.0.

---
updated-dependencies:
- 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]>

Author: dependabot[bot]

sessionize-java-client/pom.xml

@@ -298,7 +298,7 @@
 					<plugin>
 						<groupId>org.openapitools</groupId>
 						<artifactId>openapi-generator-maven-plugin</artifactId>
-						<version>6.5.0</version>
+						<version>6.6.0</version>
 						<executions>
 							<execution>
 								<goals>