Prepare for 8.2.1

[scpeters]

🎈 Release

Preparation for 8.2.1 release.

Comparison to 8.2.0: ignition-transport8_8.2.0...ign-transport8

Needed to fix debian buster build for this and downstream packages

Checklist

• Asked team if this is a good time for a release
• There are no changes to be ported from the previous major version
• No PRs targeted at this major version are close to getting in
• Bumped minor for new features, patch for bug fixes
• Updated changelog
• Updated migration guide (as needed)
• Link to PR updating dependency versions in appropriate repository in ignition-release (as needed):

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #275 (a075648) into ign-transport8 (7b3084b) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           ign-transport8     #275   +/-   ##
===============================================
  Coverage           83.77%   83.77%           
===============================================
  Files                  51       51           
  Lines                5036     5036           
===============================================
  Hits                 4219     4219           
  Misses                817      817           

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