fix(rollup-plugin): Fix relative paths on Windows env

[jussirantala]

All relative paths were resolved to current dir ./ even though they should be for example ../ on Windows 11 and it was caused because chunkInfo.fileName had backward slashes \ instead of forward slashes /. This caused broken builds.

Looks like normalize or relative doesn't work with backward slashes so the bug was fixed with replacing Windows separator with posix separator. On posix system it just replaces posix separator with posix sep again so Mac or Linux is not affected (I tested on Mac).

[changeset-bot]

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