fix(types): use correct bit length constant for sdk.Dec (backport #11332)

[mergify]

This is an automatic backport of pull request #11332 done by Mergify.
Cherry-pick of 3d3cf25 has failed:

On branch mergify/bp/release/v0.45.x/pr-11332
Your branch is up to date with 'origin/release/v0.45.x'.

You are currently cherry-picking commit 3d3cf2554.
  (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:   types/decimal.go
	modified:   types/decimal_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   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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[atheeshp]

@julienrbrt can you look into the failing jobs here, thanks!

[julienrbrt]

After accepting both changes (current + incoming), go mod tidy should be re-ran, and it should solve it.
@atheeshp As I am a Contributor, I have no pushing right in this branch, so I cannot fix that.