chore(ci): update block merge EOL workflow

See nextcloud/.github#329

Signed-off-by: Benjamin Gaussorgues <benjamin.gaussorgues@nextcloud.com>

.github/workflows/block-merge-eol.yml

@@ -34,4 +34,4 @@ jobs:
 
       - name: Checking if ${{ env.server_major }} is EOL
         run: |
-          php -r 'echo json_encode(require_once "config.php");' | jq --arg version "${{ env.server_major }}" '.stable[$version]["100"].eol // .beta[$version]["100"].eol' | grep --silent -i 'false'
+          php -r 'echo json_encode(require_once "config.php");' | jq --arg version "${{ env.server_major }}" '.stable[$version]["100"].eol // .beta[$version]["100"].eol // "NotEOL"' | grep -q "NotEOL"