jackson-annotation release version 2.20

[erik-meuwese-topicus]

The last release of jackson-annotation has 2.20 as version number. This is not semver. The other compents have version number 2.20.0. The pull requests of tools like dependabot and renovate fail when all jackson components use a property for the version in maven.

Could jackson-annotation has 2.20 get a new tag and release with 2.20.0

[pjfanning]

see FasterXML/jackson-annotations#307

[cowtowncoder]

For SemVer purposes 2.20 is same as 2.20.0; just omitting useless never-changing patch version.

But as per @pjfanning see annotations/307 for more info.