chore: remove x/gov module dependencies in x/staking

[atheeshp]

Description

Closes: #16472
ref: #13025

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[faddat]

this is good :D

[julienrbrt]

lgtm!

[julienrbrt]

Thank you for the change, I know it is a bit out of scope of this PR but could you update it here too:

• cosmos-sdk/x/auth/keeper/msg_server.go

  Line 27 in 629dc63

  "expected gov account as only signer for proposal message; invalid authority; expected %s, got %s",