square/go-jose is deprecated, use successor

[majst01]

github.com/go-jose/go-jose/v3 is now maintained

also upgrade to go-1.21

[codecov-commenter]

Codecov Report

Merging #34 (89ddf28) into master (bd1683f) will increase coverage by 6.56%.
Report is 27 commits behind head on master.
The diff coverage is 83.91%.

❗ Current head 89ddf28 differs from pull request most recent head 4646fd1. Consider uploading reports for the commit 4646fd1 to get more accurate results

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@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   73.43%   80.00%   +6.56%     
==========================================
  Files           3        8       +5     
  Lines         256      635     +379     
==========================================
+ Hits          188      508     +320     
- Misses         58       92      +34     
- Partials       10       35      +25     

Files Changed	Coverage Δ
user.go	22.91% <0.00%> (ø)
token.go	75.00% <75.00%> (ø)
dex.go	83.05% <83.33%> (+0.29%)	⬆️
issuercache.go	87.17% <87.17%> (ø)
tokenheader.go	89.47% <89.47%> (ø)
genericOidc.go	91.54% <91.54%> (ø)
mac.go	88.04% <100.00%> (ø)
usergetterproxy.go	100.00% <100.00%> (ø)

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