This bumps etherpad to 1.9.5. The changelog is minimal for this update,
but upstream switches to nodejs 20 by default so we make the same update
here. We also remove TidyHTML configs from our configs to match upstream
updates that did the same thing. Complete release notes can be found
here:
https://github.com/ether/etherpad-lite/blob/v1.9.5/CHANGELOG.md
We should hold a node and test functionality before merging this change.
Change-Id: Ib6cd888f35624490f630e091f184946e9c4e48aa
a0089cfac6