Restore Firefox compatibility

[aler9]

Description

Patch #801 silently changed the way this library reacts to unknown signature algorithms - they were silently skipped before, now they cause a fatal error. This broke compatibiliy with remote peers that are advertising unhandled algorithms (like SHA256+DSA), and going all way to the top prevents Firefox from interacting with pion/webrtc.

This patch fixes the issue by restoring the old behavior of skipping unknown signature algorithms.

Reference issue

bluenviron/mediamtx#5838

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.87%. Comparing base (12eb398) to head (fd356c9).

Additional details and impacted files

@@            Coverage Diff             @@
##               v3     #841      +/-   ##
==========================================
+ Coverage   82.69%   82.87%   +0.18%     
==========================================
  Files         123      121       -2     
  Lines        7002     6930      -72     
==========================================
- Hits         5790     5743      -47     
+ Misses        806      787      -19     
+ Partials      406      400       -6     

Flag	Coverage Δ
go	82.87% <100.00%> (+0.18%)	⬆️

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[JoTurk]

hello @aler9.
damn, thank you for the fix, firefox also broke compatibility with us recently https://bugzilla.mozilla.org/show_bug.cgi?id=2033783 and it was one of the reasons we decided to freeze dtls 1.3 and new work from getting released as v3 and until dtls and browser interop is ready (I'll try to finish them this weekend) https://github.com/pion/browser-tests https://github.com/pion/dtls-interop

Can you make this PR target v3 branch? because main has breaking changes for dtls 1.3.

[aler9]

@JoTurk i've rebased against v3.

[JoTurk]

Thank you @aler9 and sorry about the bad patch, I'll release this, and retract the bad version.

[JoTurk]

@aler9 released in v3.1.4.