chore(deps): update dependency ether/etherpad-lite to v1.9.4

[renovate]

This PR contains the following updates:

Package	Update	Change
ether/etherpad-lite	patch	v1.9.3 -> v1.9.4

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Release Notes

ether/etherpad-lite (ether/etherpad-lite)

v1.9.4

Compare Source

Compability changes

• Log4js has been updated to the latest version. As it involved a bump of 6 major version a lot has changed since then. Most notably the console appender has been deprecated. You can find out more about it here

Notable enhancements and fixes

• Fix for MySQL: The logger calls were incorrectly configured leading to a crash when e.g. somebody uses a different encoding than standard MySQL encoding.

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