x/staking v0.43 Audit updates

[likhita-809]

Description

ref: #9218

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #9267 (363e87b) into master (9038dfe) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #9267   +/-   ##
=======================================
  Coverage   60.32%   60.32%           
=======================================
  Files         591      591           
  Lines       36936    36936           
=======================================
  Hits        22282    22282           
  Misses      12683    12683           
  Partials     1971     1971           

Impacted Files	Coverage Δ
x/staking/client/cli/query.go	0.00% <ø> (ø)
x/staking/keeper/grpc_query.go	62.87% <ø> (ø)
x/staking/keeper/msg_server.go	0.45% <ø> (ø)
x/staking/client/testutil/suite.go	99.49% <100.00%> (ø)

[amaury1093]

overall lgtm, would like to remove mentions of ServiceMsg (related to #9208)

[amaury1093]

lgtm 👍

[atheeshp]

LGTM