chore: upgrade go version to 1.21.3

[lvrach]

Description

Upgrading go patch version to address

Linear Ticket

https://linear.app/rudderstack/issue/PIPE-414/chore-upgrade-go-version-to-go1213

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (28497cf) 71.39% compared to head (2b7730e) 71.39%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3973   +/-   ##
=======================================
  Coverage   71.39%   71.39%           
=======================================
  Files         371      371           
  Lines       54472    54475    +3     
=======================================
+ Hits        38889    38892    +3     
+ Misses      13270    13269    -1     
- Partials     2313     2314    +1     

Files	Coverage Δ
warehouse/api/http.go	78.94% <100.00%> (+0.22%)	⬆️

... and 10 files with indirect coverage changes

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