scripts/release: sync remaining changes from LiberTEM

[sk1p]

As I'm updating the release script in LiberTEM, with this change I also reduce the size of the diff between the two. I think it might make sense to soon extract some of the CI and release stuff into its own repo, but until then I'll sync like this.

Contributor Checklist:

• I have added myself to the creators.json file
• I have added a changelog entry for my contribution
• I have added/updated documentation for all user-facing changes
• I have added/updated test cases

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.81%. Comparing base (8aaab1b) to head (cc2d2a1).

❗ Current head cc2d2a1 differs from pull request most recent head 41b36ce. Consider uploading reports for the commit 41b36ce to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   86.81%   86.81%           
=======================================
  Files          14       14           
  Lines        1191     1191           
  Branches      171      171           
=======================================
  Hits         1034     1034           
  Misses        105      105           
  Partials       52       52           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.