Bump version from 1.22.0 to 1.22.1

[JamesWTruher]

PR Summary

Due to MS compliance we need a new release using the new signing pipeline. updating the release version for this.

PR Checklist

• [x] PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• [x] Summarized changes
• [x] Change is not breaking
• [x] Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• [x] Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• [x] This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.

[kilasuit]

@bergmeister as an aside perhaps it's worth having a test to check the version number is updated in all the right places, so that in future this isn't missed

That or build a script that will replace it across all those files based on what GitVersion outputs for the next version, as that would allow this to be caught in local builds as well as hosted pipeline builds too