chore: bump angular to v21

[cipchk]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.83%. Comparing base (6e0f037) to head (1d6bf90).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   97.56%   95.83%   -1.73%     
==========================================
  Files           2        2              
  Lines          41       48       +7     
  Branches        5       16      +11     
==========================================
+ Hits           40       46       +6     
- Misses          1        2       +1     

Flag	Coverage Δ
unittests	95.83% <100.00%> (-1.73%)	⬇️

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