Makefile: use go1.22 semantics for gofumpt

[thaJeztah]

gofumpt defaults to using the go version from go.mod, but as we don't have one, we need to set it explicitly.

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.50%. Comparing base (26526f9) to head (b8fd205).
Report is 26 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #5684 +/- ##
==========================================
- Coverage 59.53% 59.50% -0.03% 
==========================================
Files 346 346 Lines 29371 29371 ==========================================
- Hits 17486 17478 -8 - Misses 10914 10923 +9 + Partials 971 970 -1 

[vvoland]

nit: We could probably have a variable on the top of the file so it's more discoverable

[thaJeztah]

Hm. Yeah, I was considering a bit how we could improve this, and went a bit back-and-forth;

• It's not really critical (switching did not result in a diff, so looks like there were no version-specific changes)
• It should no longer be needed when we have a go.mod, so .. 🤞 should go away in the near future (so didn't want to add the extra code-churn)
• but I think we should look if we can containerise this (add a docker bake target); that way we would remove the requirement to have gofumpt installed, and make sure that we run it in a consistent environment (and expected version of go)
• ☝️ similar to how we do vendoring
• Was actually asking @crazy-max Yesterday (i.e., should we have some templates for such things?); related to Gofumpt all the things compose#12392 (comment)

[thaJeztah]

Let me bring this one in, but if I have some time, I may have a look if we can containerise this (per above)