Guessing the next release with prereleases is not honored

[wagoodman]

Given a changelog with no patch fixes and a previous release that has a prerelease indicator, chronicle should not bump the patch version:

./.tmp/chronicle -vvv -n --version-file VERSION
   Changelog                                                                                                          
                                                                                                                      
  ## v0.14.1 https://github.com/anchore/grype-db/tree/v0.14.1 (2023-02-16)                                            
                                                                                                                      
  Full Changelog https://github.com/anchore/grype-db/compare/v0.14.0-rc1...v0.14.1            

Chronicle should either:

• default to the next release candidate: v0.14.0-rc2
• or default to the final release: v0.14.0