common-updater-scripts: Fix replacement failure detections

Previously, we only made `sed` back up the version replacement.
This meant that `cmp` would already recognize the files
as changed before replacing hash and the other values,
and the error would not be printed.

Let’s always make the `sed` create a backup so that we can
detect success of each situation. This will no longer
allow us to revert to the original version on failure
but the updated file should be tracked in git anyway.

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