Update yarn.lock and fix Docker builds

[jaller94]

• Fixes yarn.lock seems out of sync for v2.0.0 #824
• Part of Prebuilt Docker images? #822 – given that @Half-Shot publishes the Docker image.
• Supersedes update python to python3 #798
• Upgrades matrix-appservice-bridge to v5.0.0 which requires Node.js 16, 17 or 18

[jaller94]

With 3e491ca this is now a breaking change that requires a new major version.

Because of the library matrix-appservice-bridge v5.0.0 the supported Node.js versions are 16 and 18.

[Half-Shot]

I don't think we need to be explicit about all the versions we support, 16 is the headline. Otherwise, lgtm.

[Half-Shot]

Suggested change

	Require Node.js 16, 17 or 18 to run. Update yarn.lock and fix Docker builds.
	Minimum required Node.js version is now 16.

[Half-Shot]

This also needs to be a .removal to indicate that it's a breaking change.