fix: render filename with dollar sign

[JSerFeng]

Summary

If filename contains dollar sign ($), output.filename renders to unexpected result, for example

FILENAME.replace_all(template, "foo$0")

the foo$0 is treat like a capture pattern, the '$0' is missing in the result

see https://docs.rs/regex/latest/regex/struct.Regex.html#replacement-string-syntax.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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