x/staking should not depend on x/gov

[kocubinski]

Create a new error type instead of reusing the one in x/gov:

cosmos-sdk/x/staking/keeper/msg_server.go

Line 545 in c8ab555

return nil, errorsmod.Wrapf(govtypes.ErrInvalidSigner, "invalid authority; expected %s, got %s", k.authority, msg.Authority)

Use a hard coded const string:

cosmos-sdk/x/staking/module.go

Line 235 in 166be37

authority := authtypes.NewModuleAddress(govtypes.ModuleName)

cosmos-sdk/x/staking/keeper/keeper_test.go

Line 63 in c8ab555

authtypes.NewModuleAddress(govtypes.ModuleName).String(),