Bump CI runner image to ubuntu-22.04

[rkm]

Proposed Changes

Test with Ubuntu 22.04.

Types of changes

What types of changes does your code introduce? Tick all that apply.

• Bugfix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that would cause existing functionality to not work as expected)
• Documentation-Only Update (if none of the other choices apply)
  • In this case, ensure that the message of the head commit from the source branch is prefixed with [skip ci]

Checklist

By opening this PR, I confirm that I have:

• Reviewed the contributing guidelines for this repository
• Ensured that the PR branch is in sync with the target branch (i.e. it is automatically merge-able)
• Updated any relevant API documentation
• Created or updated any tests if relevant
• Created a news file
  • NOTE: This must include any changes to any of the following files: default.yaml, any of the RabbitMQ server configurations, GlobalOptions.cs
• Listed myself in the CONTRIBUTORS file 🚀
• Requested a review by one of the repository maintainers

Issues

Fixes #1716

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.96%. Comparing base (018ca35) to head (9d49363).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1723      +/-   ##
==========================================
+ Coverage   60.93%   60.96%   +0.03%     
==========================================
  Files         177      177              
  Lines        6559     6559              
  Branches      898      898              
==========================================
+ Hits         3997     3999       +2     
+ Misses       2290     2289       -1     
+ Partials      272      271       -1     

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