Handle special chars in filenames

[vinaypuppal]

Hi, thanks for this awesome action. Noticed this error with my coverage files

"Invalid regular expression: /.*filename=\"folder\\/tests\\/__snapshots__\\/test_handlers\\/test_handle[example.com-test0].json\".*line-rate=\"(?<cover>[0-9]+[.]*[0-9]*)\".*/: Range out of order in character class"

The error is because of [example.com-test0] in filename as [ and ] are valid regex syntax.

With this PR filenames with special characters will be correctly handled and escaped with a backslash ()