Remove : from filenames

[endorama]

Using : char in filenames is only supported on Linux, thus this may break changelog consolidation after creating a changelog fragment (either locally or in CI).

This PR sanitize filename for : char too, removing it.

More about supported chars in filenames: https://stackoverflow.com/a/35352640

[elasticmachine]

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• Start Time: 2023-06-19T10:18:20.564+0000

• Duration: 4 min 4 sec

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