fix: don't enforce jwk signing algorithm if empty

[ctrlaltf24]

Makes the CoreClient::new function usable for claim verification again, as it was in 2.4, while still enforcing IF we have enough context to do so, improving usability of the library.

When attempting to verify a claim using CoreClient::new (as done in 2.4) in version 2.5, the error Signature verification failed\\n\\nCaused by:\\n Disallowed signature algorithm: algorithmRS256is not one of: \" is returned (due to Client::new setting an empty array for supported algorithms).

Context:

OIDC provider: auth0 or google version: 2.5

[ramosbugs]

Thanks for the PR! This bug fix makes sense. I'll backport it to the support/2.x branch and cut a 2.5.1 release since 3.0 isn't ready yet.

[codecov[bot]]

Codecov Report

Merging #104 (edb81f7) into support/2.x (0db8ad1) will decrease coverage by 0.11%. The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           support/2.x     #104      +/-   ##
===============================================
- Coverage        72.68%   72.57%   -0.11%     
===============================================
  Files               16       16              
  Lines             3921     3920       -1     
===============================================
- Hits              2850     2845       -5     
- Misses            1071     1075       +4     

Impacted Files	Coverage Δ
src/lib.rs	69.67% <0.00%> (-1.04%)	:arrow_down:

... and 1 file with indirect coverage changes

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[ramosbugs]

This is now released in 2.5.1