style: lint stableswap the same as the rest of osmosis (backport #5105)

[mergify]

This is an automatic backport of pull request #5105 done by Mergify.
Cherry-pick of c1c96f4 has failed:

On branch mergify/bp/v15.x/pr-5105
Your branch is up to date with 'origin/v15.x'.

You are currently cherry-picking commit c1c96f44.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .golangci.yml
	modified:   x/gamm/pool-models/stableswap/amm.go
	modified:   x/gamm/pool-models/stableswap/amm_test.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   go.sum
	deleted by us:   tests/cl-go-client/go.mod
	deleted by us:   tests/cl-go-client/go.sum

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[faddat]

k :)

[faddat]

state breaking lets ditch