chore(deps): update etherpad/etherpad docker tag to v1.9.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
etherpad/etherpad	final	patch	1.9.2 -> 1.9.3

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Release Notes

ether/etherpad-lite (etherpad/etherpad)

v1.9.3

Compare Source

Compability changes

• express-rate-limit has been bumped to 7.0.0: This involves the breaking change that "max: 0"
  in the importExportRateLimiting is set to always trigger. So set it to your desired value.
  If you haven't changed that value in the settings.json you are all set.

Notable enhancements and fixes

• Bugfixes

  • Fix etherpad crashing with mongodb database

• Enhancements

  • Add surrealdb database support. You can find out more about this database here.
  • Make sqlite faster: The sqlite library has been switched to better-sqlite3. This should lead to better performance.

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Configuration

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