chore: use math.Int instead of math.Int and apply linting (#12702)

* linting round

* fix changelog

* revert docs changes

* Update CHANGELOG.md

* revert an accidental change to security.md

* Update simapp/integration/client/grpc/tmservice/service_test.go

Co-authored-by: Julien Robert <julien@rbrt.fr>

x/params/proposal_handler_test.go

@@ -1,9 +1,10 @@
 package params_test
 
 import (
-	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
 	"testing"
 
+	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
+
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/suite"