make: allow using a development version of Go, with a warning

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area security
• /area configuration

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[codecov]

Codecov Report

Merging #2260 (a8a0ed6) into master (a4eee41) will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2260      +/-   ##
==========================================
+ Coverage   55.51%   55.64%   +0.12%     
==========================================
  Files         178      182       +4     
  Lines       25150    25533     +383     
==========================================
+ Hits        13963    14207     +244     
- Misses       9661     9762     +101     
- Partials     1526     1564      +38     

Flag	Coverage Δ
bats	37.27% <ø> (ø)
unit-linux	54.52% <ø> (ø)
unit-windows	50.93% <ø> (?)

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see 4 files with indirect coverage changes

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