chore: remove obsolete header

[kevgo]

The "format" CI task is stand-alone again.

[codecov]

Codecov Report

Merging #3334 (e48049c) into master (736aaef) will decrease coverage by 2.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3334      +/-   ##
==========================================
- Coverage   79.21%   76.88%   -2.34%     
==========================================
  Files         123      123              
  Lines       12915     8920    -3995     
==========================================
- Hits        10231     6858    -3373     
+ Misses       2078     1635     -443     
+ Partials      606      427     -179     

Impacted Files	Coverage Δ
driver/registry.go	24.24% <0.00%> (-12.35%)	⬇️
jwk/jwt_strategy.go	56.66% <0.00%> (-12.09%)	⬇️
cmd/cmd_create_client.go	72.72% <0.00%> (-10.09%)	⬇️
spec/config.go	40.00% <0.00%> (-10.00%)	⬇️
client/client.go	75.75% <0.00%> (-9.86%)	⬇️
cmd/cmd_perform_client_credentials.go	76.31% <0.00%> (-9.65%)	⬇️
cmd/cmd_create_jwks.go	80.00% <0.00%> (-9.59%)	⬇️
x/secret.go	80.00% <0.00%> (-8.89%)	⬇️
oauth2/handler.go	68.51% <0.00%> (-8.75%)	⬇️
oauth2/equalKeys.go	50.00% <0.00%> (-8.50%)	⬇️
... and 113 more

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