Fix syntax

Author: pquentin

.github/workflows/check-backport-labels.yml

@@ -21,5 +21,5 @@ jobs:
           echo "${{ contains(github.event.pull_request.labels.*.name, 'backport') }}"
           echo "${{ endsWith(github.event.pull_request.labels.*.name, 'backport') }}"
           echo "${{ startsWith(github.event.pull_request.labels.*.name, 'backport') }}"
-          echo "${{ github.event.pull_request.labels.*.name == 'skip-backport') }}"
+          echo "${{ github.event.pull_request.labels.*.name == 'skip-backport' }}"
           exit 1