Speedup more stable swap math operations (backport #7214)

[mergify]

This is an automatic backport of pull request #7214 done by Mergify.
Cherry-pick of 9cd7231 has failed:

On branch mergify/bp/v21.x/pr-7214
Your branch is up to date with 'origin/v21.x'.

You are currently cherry-picking commit 9cd72313.
  (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:   osmomath/binary_search.go
	modified:   osmomath/sigfig_round.go
	modified:   x/gamm/pool-models/stableswap/amm.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.mod
	both modified:   go.sum
	both modified:   osmomath/decimal.go
	both modified:   osmomath/decimal_test.go

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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[github-actions]

Important Notice

This PR modifies an in-repo Go module. It is one of:

• osmomath
• osmoutils
• x/ibc-hooks
• x/epochs

The dependent Go modules, especially the root one, will have to be
updated to reflect the changes. Failing to do so might cause e2e to fail.

Please follow the instructions below:

1. Open https://github.com/osmosis-labs/osmosis/actions/workflows/go-mod-auto-bump.yml
2. Provide the current branch name
3. On success, confirm if an automated commit corretly updated the go.mod and go.sum files

Please let us know if you need any help.