ALFREDAPI-580: Post-release bump

[WimCrols]

Fixes https://xenitsupport.jira.com/browse/ALFREDAPI-580

• Is CHANGELOG.md extended?
• Does this PR avoid breaking the API?
  Breaking changes include adding, changing or removing endpoints and/or JSON objects used in requests and responses.
• Are all Alfresco services wired via ServiceRegistry (and not per service), and is ServiceRegistry autowired with @Qualifier("ServiceRegistry")?
• Does the PR comply to REST HTTP result codes policy outlined in the user guide?
• Is error handling done through a method annotated with @ExceptionHandler in the webscript classes?
• Does the PR follow our coding styleguide and other active procedures?
• Is usage of this. prefix avoided?

See README.md for full explanation.

[codingBenVdS]

updated version as preparation for next release.
Approved.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[WimCrols]

I had to update the version, because 6.1.2 was published.