fix: Use bytes instead of string comparison in delete validator queue (backport cosmos/cosmos-sdk#12303) (backport #1301)

[mergify]

Description

Cherry-pick of:

• fix: Use bytes instead of string comparison in delete validator queue cosmos/cosmos-sdk#12303

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

---

This is an automatic backport of pull request #1301 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 1038a39 has failed:

On branch mergify/bp/release/v0.48.x/pr-1301
Your branch is up to date with 'origin/release/v0.48.x'.

You are currently cherry-picking commit 1038a394c.
  (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:   x/staking/keeper/validator.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

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

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 69.78%. Comparing base (a496d32) to head (ff40409).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release/v0.48.x    #1309      +/-   ##
===================================================
- Coverage            69.78%   69.78%   -0.01%     
===================================================
  Files                  646      646              
  Lines                67532    67541       +9     
===================================================
+ Hits                 47130    47134       +4     
- Misses               18215    18218       +3     
- Partials              2187     2189       +2     

Files	Coverage Δ
x/staking/keeper/validator.go	81.09% <54.54%> (-1.17%)	⬇️