feat: allow additional id token audiences

[jonas-jonas]

Fixes ory/network#343

Related issue(s)

Checklist

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• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
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Further Comments

[codecov]

Codecov Report

Merging #3616 (0bc6807) into master (f7c6767) will decrease coverage by 0.51%.
Report is 2 commits behind head on master.
The diff coverage is 91.66%.

❗ Current head 0bc6807 differs from pull request most recent head 6035910. Consider uploading reports for the commit 6035910 to get more accurate results

@@            Coverage Diff             @@
##           master    #3616      +/-   ##
==========================================
- Coverage   78.79%   78.29%   -0.51%     
==========================================
  Files         343      343              
  Lines       24024    23406     -618     
==========================================
- Hits        18930    18326     -604     
- Misses       3700     3701       +1     
+ Partials     1394     1379      -15     

Files	Coverage Δ
selfservice/strategy/oidc/provider_apple.go	35.00% <100.00%> (-3.64%)	⬇️
selfservice/strategy/oidc/provider_config.go	60.00% <ø> (ø)
selfservice/strategy/oidc/provider_google.go	89.18% <100.00%> (+2.52%)	⬆️
selfservice/strategy/oidc/token_verifier.go	90.00% <90.00%> (ø)

... and 11 files with indirect coverage changes

[aeneasr]

I suggest initializing this with a default error, otherwise the default err is nil, so no error, so audience validated.

[jonas-jonas]

Good point, I added the fallback.