[admin] update CHANGES and CREDITS for v2.2.0 (#307)

[antond-weta]

Description

Tests

Checklist:

• I have read the contribution guidelines.
• I have updated the documentation, if applicable. (Check if there is no
  need to update the documentation, for example if this is a bug fix that
  doesn't change the API.)
• I have ensured that the change is tested somewhere in the testsuite
  (adding new test cases if necessary).
• My code follows the prevailing code style of this project. If I haven't
  already run clang-format before submitting, I definitely will look at the CI
  test that runs clang-format and fix anything that it highlights as being
  nonconforming.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.89%. Comparing base (31225f3) to head (647cc97).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #308      +/-   ##
==========================================
+ Coverage   91.87%   91.89%   +0.02%     
==========================================
  Files          17       17              
  Lines        3777     3777              
  Branches      559      558       -1     
==========================================
+ Hits         3470     3471       +1     
+ Misses        307      306       -1     

see 1 file with indirect coverage changes

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