chore: remove unused go-version file

[sozercan]

What this PR does / why we need it:

this seems to be causing confusion and it is not being used

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #

Special notes for your reviewer:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.56%. Comparing base (3350319) to head (12e4971).
Report is 205 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (3350319) and HEAD (12e4971). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (3350319)	HEAD (12e4971)
unittests	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3711      +/-   ##
==========================================
- Coverage   54.49%   47.56%   -6.94%     
==========================================
  Files         134      236     +102     
  Lines       12329    19909    +7580     
==========================================
+ Hits         6719     9469    +2750     
- Misses       5116     9549    +4433     
- Partials      494      891     +397     

Flag	Coverage Δ
unittests	47.56% <ø> (-6.94%)	⬇️

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[ritazh]

Looks like some tools or CI/CD might be using it. Maybe we should try to keep it up to date whenever we update Dockerfile instead of deleting it? WDYT?

[sozercan]

imo this is dead code that we should remove since it leads to misunderstandings, and there's no way to keep it up to date since dependabot doesn't support it (since it's not a real convention). it's 100% not used by anything within GK build, and go has support for things like toolchain to support switching go versions.