fix: claims keys concurrency

[skynet2]

fatal error: concurrent map writes

goroutine 26200 [running]:
github.com/trustbloc/vcs/pkg/service/verifypresentation.(*Service).checkCredentialStrict(0xc00015b9c0, {0x2028368, 0xc005c7a810}, {0xc000302ba0, 0x1, 0xc003d39c40?})
/go/src/github.com/trustbloc/vcs/.build/vcs/pkg/service/verifypresentation/verifypresentation_service.go:205 +0x1f7
github.com/trustbloc/vcs/pkg/service/verifypresentation.(*Service).VerifyPresentation(0xc00015b9c0, {0x2028368, 0xc005c7a810}, 0xc007628f20, 0x0?, 0xc0072562c0)

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (d3244d0) 85.40% compared to head (ae8aaf8) 85.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1461   +/-   ##
=======================================
  Coverage   85.40%   85.40%           
=======================================
  Files         164      164           
  Lines       10272    10267    -5     
=======================================
- Hits         8773     8769    -4     
+ Misses       1094     1092    -2     
- Partials      405      406    +1     

Files	Coverage Δ
pkg/restapi/v1/verifier/controller.go	92.25% <100.00%> (ø)
pkg/service/oidc4vp/oidc4vp_service.go	89.93% <100.00%> (ø)
...e/verifypresentation/verifypresentation_service.go	83.85% <81.81%> (-0.09%)	⬇️
...s/verifypresentation/verifypresentation_wrapper.go	75.00% <62.50%> (ø)

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