Bumping the CI & Dockerfile to go 1.21

[olegbespalov]

What?

This change switches the default's go version used for building k6 to go1.21.

Why?

The go 1.21 is the current default version of the go.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make ci-like-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)

Changelog

internal: Updates CI & Dockerfile to go 1.21

This switches the default's go version used for building k6 to go1.21.

[codebien]

Honestly, I would prefer if we wait for a .1 release, it seems there are already a bunch of issues reported https://github.com/golang/go/milestone/328

[olegbespalov]

Sure, we could wait for merging for the first patch release, but in fact, there will be no changes in the code of the PR

[mstoykov]

Can we also update the commit and PR name to specify this is bumping the CI to 1.21

[olegbespalov]

@mstoykov we could, but this PR updates the Dockerfile, so it's not only about CI. However, if you still think that the commit message/PR title bumping the CI to 1.21 fits better I don't mind updating it.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.02% ⚠️

Comparison is base (2640a6b) 73.17% compared to head (373f0a9) 73.16%.

❗ Current head 373f0a9 differs from pull request most recent head 4fc6cb0. Consider uploading reports for the commit 4fc6cb0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3283      +/-   ##
==========================================
- Coverage   73.17%   73.16%   -0.02%     
==========================================
  Files         258      258              
  Lines       19912    19912              
==========================================
- Hits        14571    14569       -2     
- Misses       4416     4418       +2     
  Partials      925      925              

Flag	Coverage Δ
ubuntu	73.04% <ø> (-0.08%)	⬇️
windows	73.01% <ø> (+0.01%)	⬆️

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see 1 file with indirect coverage changes

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[olegbespalov]

@mstoykov Anyway, I think maybe you meant more commit's atomicity, so I've tried to split it into the parts. Let me know if that works or additional details ☺️

[mstoykov]

@olegbespalov I mostly wanted for it to specify we don't just ... I don't know start using 1.21 features and users need 1.21 to compile

[olegbespalov]

Ah, I see, make sense 👍