chore: bump angular to 20

[cipchk]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 67.64%. Comparing base (442efb5) to head (c1d297c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/src/highlight-js.config.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   70.58%   67.64%   -2.95%     
==========================================
  Files           3        3              
  Lines          68       68              
  Branches       15       15              
==========================================
- Hits           48       46       -2     
- Misses         16       19       +3     
+ Partials        4        3       -1     

Flag	Coverage Δ
unittests	67.64% <0.00%> (-2.95%)	⬇️

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