ffmpegthumbnailer: update for upstream reupload
ffmpegthumbnailer: update for upstream reupload

To be fair, upstream did not retag, seeing that the commit and the
SHA-256 sum of the source code archive at the tag did not
change. However, it appears that upstream reuploaded an artifact (a
tarball that is minimally different from the source code archive) that
this formula was using.

In this commit we switch back to the source code archive because

1. We've been using the source code archive up to the last revision to
   this formula in #49296;
2. I didn't see any build or test issue with that;
3. Upstream did not retag, so one should treat this archive as usable;
   if not, it is the upstream's responsibility to make a new release (or
   at least retag, however abonimable it is), not ours.

Closes #49398.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

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