use simpler url for maven central deployment notifiaction

Author: infeo

.github/workflows/publish-github.yml

@@ -35,6 +35,6 @@ jobs:
           SLACK_ICON_EMOJI: ':bot:'
           SLACK_CHANNEL: 'cryptomator-desktop'
           SLACK_TITLE: "Published ${{ github.event.repository.name }} ${{ github.event.release.tag_name }}"
-          SLACK_MESSAGE: "Ready to <https://github.com/${{ github.repository }}/actions?query=workflow%3A%22Publish+to+Maven+Central%22|deploy to Maven Central>."
+          SLACK_MESSAGE: "Ready to <https://github.com/${{ github.repository }}/actions/workflows/publish-central.yml|deploy to Maven Central>."
           SLACK_FOOTER:
           MSG_MINIMAL: true