Replace alexwilson/enable-github-automerge-action

[skjnldsv]

cc @nickvergessen

Seems that this action is very old and unmaintained.
Can we use https://github.com/pascalgn/automerge-action/ instead maybe?

https://github.com/nextcloud/.github/blob/ae1b8e5dbeb2480d75fc65646ca6e59348a5dc67/workflow-templates/update-nextcloud-ocp-approve-merge.yml

[nickvergessen]

if it works similarly sure
I found this and it worked, commits seemed regularly, but yeah seems like it's only automerges :D

[susnux]

Seems that this action is very old and unmaintained.

Update for Node 20 was release Feb. 17. So seems to be still maintained?