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>

store/iavl/store.go

@@ -417,6 +417,7 @@ var _ types.Iterator = (*iavlIterator)(nil)
 // newIAVLIterator will create a new iavlIterator.
 // CONTRACT: Caller must release the iavlIterator, as each one creates a new
 // goroutine.
+//nolint:deadcode,unused
 func newIAVLIterator(tree *iavl.ImmutableTree, start, end []byte, ascending bool) *iavlIterator {
 	iterator, err := tree.Iterator(start, end, ascending)
 	if err != nil {