Update node to 20.10 and libxmljs to 1.0

[fgaz]

Fixes #482

Some other dependencies are more difficult to update, but fortunately only libxmljs was blocking the node update

[b-g]

That was quick! Many thanks! Did you test all helpers e.g. npm run XXX? Nothing broken? Please confirm.

https://github.com/hfg-gmuend/openmoji/tree/master/helpers#openmoji-helpers-scripts

[b-g]

Ping: Did you test everything in https://github.com/hfg-gmuend/openmoji/tree/master/helpers#openmoji-helpers-scripts with node 20.10? I'm a bit hesitant to change the running system ... for no urgent need.

[b-g]

Closed due to inactivity.