doc: Update bug issue filter

[dweindl]

Include both, type=bug and label=bug issues in filter. Nonetheless, I'll change the current bug issues from label to type.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.97%. Comparing base (3d695c5) to head (ef7516c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3260      +/-   ##
==========================================
- Coverage   78.52%   77.97%   -0.56%     
==========================================
  Files         318      318              
  Lines       22199    22199              
  Branches     1490     1490              
==========================================
- Hits        17432    17309     -123     
- Misses       4759     4882     +123     
  Partials        8        8              

Flag	Coverage Δ
cpp	72.31% <ø> (+0.01%)	⬆️
cpp_python	35.24% <ø> (ø)
petab	48.44% <ø> (ø)
petab_sciml	16.45% <ø> (ø)
petab_sciml_benchmarks	15.00% <ø> (ø)
python	70.76% <ø> (+<0.01%)	⬆️
sbmlsuite-jax	?

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see 6 files with indirect coverage changes

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