Revert "Pin golang version to 1.21.5 in github actions and docker"

[mstoykov]

What?

This reverts commit 3808747.

Why?

We need that to release v0.48.0 with the latest golang version. But we really don't want to keep having to bump this every time so it is better to just use the wildcard version.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (47c0a26) 73.22% compared to head (57f81bd) 73.22%.

❗ Current head 57f81bd differs from pull request most recent head c8952eb. Consider uploading reports for the commit c8952eb to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3492   +/-   ##
=======================================
  Coverage   73.22%   73.22%           
=======================================
  Files         267      267           
  Lines       20083    20083           
=======================================
+ Hits        14705    14706    +1     
+ Misses       4465     4463    -2     
- Partials      913      914    +1     

Flag	Coverage Δ
ubuntu	73.17% <ø> (+<0.01%)	⬆️
windows	73.06% <ø> (-0.01%)	⬇️

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[codebien]

In my experience, it should be enough if we force the cache once then the next build should pick up the right version. We have workflow_dispatch for the build workflow so we might manually trigger a new job to force a build with a newly released Go version.

[olegbespalov]

Let's wait a bit with merging. We have no pressure and could wait 1-2 days till actually the go 1.21.5 will be rolled out fully in CI.

[olegbespalov]

@mstoykov since in any case we started "the great merging" see no more reasons for postponing this merge 👍