Release 3.2.0

Refactoring and fixes

• expect up to 3 PPAKeySubmissionMetadata (#611)
• ensure proper shutdown of 'retention' job (#608)

Dependencies and version updates

• Bump checkstyle from 10.7.0 to 10.8.0 (#628)
• Bump commons-fileupload to 1.5 (#620)
• Bump feign.version from 12.1 to 12.2 (#627)
• Bump google-http.version from 1.42.3 to 1.43.0 (#622)
• Bump jackson to 2.14.2 (#620)
• Bump log4j.version from 2.19.0 to 2.20.0 (#614)
• Bump maven-assembly-plugin from 3.4.2 to 3.5.0 (#617)
• Bump maven-compiler-plugin from 3.10.1 to 3.11.0 (#626)
• Bump maven-deploy-plugin from 3.0.0 to 3.1.0 (#621)
• Bump maven-enforcer-plugin from 3.1.0 to 3.2.1 (#623)
• Bump maven-failsafe-plugin from 3.0.0-M8 to 3.0.0-M9 (#625)
• Bump maven-javadoc-plugin from 3.4.1 to 3.5.0 (#615)
• Bump maven-surefire-plugin from 3.0.0-M8 to 3.0.0-M9 (#624)
• Bump maven-surefire-report-plugin from 3.0.0-M8 to 3.0.0-M9 (#616)
• Bump postgresql to 42.5.4 (#620)
• Bump spring-boot.version from 2.7.8 to 2.7.9 (#620)
• Bump spring-cloud to 2021.0.6 (#620)
• Bump spring-security.version from 5.7.6 to 5.8.2 (#613)
• Bump tomcat.version from 9.0.70 to 9.0.72 (#619)

Full Changelog: v3.1.0...v3.2.0