[GHA] Sign off PRs as openHAB bot

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

Author: holgerfriedrich

.github/workflows/resolver.yml

@@ -58,5 +58,8 @@ jobs:
           commit-message: "Resolve itest dependencies"
           title: "Resolve itest dependencies"
           branch: "gha/resolver/${{ github.ref_name }}"
+          author: openhab-bot <bot@openhab.org>
+          committer: openhab-bot <bot@openhab.org>
           delete-branch: true
           # labels: infrastructure
+          signoff: true

.github/workflows/update-maven.yml

@@ -79,5 +79,8 @@ jobs:
           commit-message: "Update maven wrapper to ${{ steps.maven.outputs.version }}"
           title: "Update Maven Wrapper to ${{ steps.maven.outputs.version }}"
           branch: gha/update-maven-wrapper
+          author: openhab-bot <bot@openhab.org>
+          committer: openhab-bot <bot@openhab.org>
           delete-branch: true
           labels: infrastructure
+          signoff: true