fix: correct typo 'unsufficient' to 'insufficient' (#4792)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: envestcc

action/protocol/staking/bucket_validation.go

@@ -24,7 +24,7 @@ func validateBucketOwner(bucket *VoteBucket, owner address.Address) ReceiptError
 func validateBucketMinAmount(bucket *VoteBucket, minAmount *big.Int) ReceiptError {
 	if bucket.StakedAmount.Cmp(minAmount) < 0 {
 		return &handleError{
-			err:           errors.New("bucket amount is unsufficient"),
+			err:           errors.New("bucket amount is insufficient"),
 			failureStatus: iotextypes.ReceiptStatus_ErrInvalidBucketAmount,
 		}
 	}

action/protocol/staking/bucket_validation_test.go

@@ -45,7 +45,7 @@ func TestValidateBucket(t *testing.T) {
 		_, err := csm.putBucketAndIndex(bkt)
 		r.NoError(err)
 		r.Nil(validateBucketMinAmount(bkt, big.NewInt(1000)))
-		r.ErrorContains(validateBucketMinAmount(bkt, big.NewInt(100000)), "bucket amount is unsufficient")
+		r.ErrorContains(validateBucketMinAmount(bkt, big.NewInt(100000)), "bucket amount is insufficient")
 	})
 	t.Run("validate bucket staked", func(t *testing.T) {
 		csm, _ := initState()