This patch loosens the regex that's used to fetch the version number
from the release notes file. The automation was broken due to a new heading that
was added in D7544, but the breakage only occurred after the 0.22.3 release.
The breakage resulted in archiving the release notes to a badly formed file,
effectively erasing release notes as changes were landed via the land bot.
This patch also restores the 0.22.4 release notes that got removed due to the above.