### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When calling 

`cloudWatchClient.EnableAlarmActions(&cloudwatch.EnableAlarmActionsInput{AlarmNames: alarmNames})`

with golang I receive a SerializationError with bytes in the error message saying: 

`<!DOCTYPE HTM |UBLIC "-//W3C//DTD HTML 3.2 Final//EN">.<title>500 Internal Server Error</title>.<h1>Internal Server Error</h1>.<p>The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.`

I believe this is a bug, since other cloudwatch operations like "DescribeAlarms" work flawlessly with the same client.

### Expected Behavior

I expected the call to go through without any errors

### How are you starting LocalStack?

With a `docker run` command

### Steps To Reproduce

Start localstack, create alarms and call cloudwatch "EnableAlarmActions"

### Environment

_No response_

### Anything else?

_No response_
TEST_1_DATA = "'0 - X - X'"
    TEST_2_DATA = "'0 - - - -'"
    TEST_3_DATA = "'- - - - -'"
    TEST_4_DATA = "'0 X X - X'"
    TEST_5_DATA = "'- - X - -'"
    TEST_1_M_OF_N = "'0 - X - X'"
    TEST_2_M_OF_N = "'0 0 X 0 X'"
    TEST_3_M_OF_N = "'0 - X - - '"
    TEST_4_M_OF_N = "'- - - - 0'"
    TEST_5_M_OF_N = "'- - - X -'"
    def test_comparison_operation_mapping(self):
        a = 3
        b = 4
        assert not COMPARISON_OPS.get("GreaterThanOrEqualToThreshold")(a, b)
        assert COMPARISON_OPS.get("GreaterThanOrEqualToThreshold")(a, a)
        assert COMPARISON_OPS.get("GreaterThanOrEqualToThreshold")(b, a)
        assert not COMPARISON_OPS.get("GreaterThanThreshold")(a, b)
        assert not COMPARISON_OPS.get("GreaterThanThreshold")(a, a)
        assert COMPARISON_OPS.get("GreaterThanThreshold")(b, a)
        assert COMPARISON_OPS.get("LessThanThreshold")(a, b)
        assert not COMPARISON_OPS.get("LessThanThreshold")(a, a)
        assert not COMPARISON_OPS.get("LessThanThreshold")(b, a)
        assert COMPARISON_OPS.get("LessThanOrEqualToThreshold")(a, b)
        assert COMPARISON_OPS.get("LessThanOrEqualToThreshold")(a, a)
        assert not COMPARISON_OPS.get("LessThanOrEqualToThreshold")(b, a)
    @pytest.mark.parametrize(