Fix copyright year

[t-kikuc]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Does this PR introduce a user-facing change?: no

• How are users affected by this change: no
• Is this breaking change: no
• How to migrate (if breaking change): no

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ab76373) 30.87% compared to head (9910591) 30.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4748      +/-   ##
==========================================
- Coverage   30.87%   30.85%   -0.02%     
==========================================
  Files         222      222              
  Lines       26037    26037              
==========================================
- Hits         8039     8035       -4     
- Misses      17349    17353       +4     
  Partials      649      649              

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[t-kikuc]

Sorry, I missed below

Note: File service.pb.auth.go, which is generated by our protoc-gen-auth needs to be regenerated later using the updated tool/codegen image published after this PR is merged in order to pass the action/code check (I know it's quite meta 😂), will do it later by separated PR.

#4745