Removed not working GitHub workflow.

Thanks to xet7 !

.github/workflows/owasp-zap-scan.yml

@@ -1,12 +0,0 @@
-on: [push]
-
-jobs:
-  zap_scan:
-    runs-on: ubuntu-latest
-    name: Scan the webapplication
-    steps:
-      - name: OWASP ZAP Scan
-        runs-on: ubuntu-latest
-        uses: zaproxy/action-baseline@v0.4.0
-        with:
-          target: 'https://boards.wekan.team/sign-in'