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

Author: flobernd

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

@@ -64,6 +64,7 @@ jobs:
 
                 if [[ "${pr_label}" =~ ${backport_regex} ]]; then
                   major="${BASH_REMATCH[1]}"
+                  minor="${BASH_REMATCH[2]}"
                   pr_majors+=("${major}")
                   if [[ "${pr_label}" == *x ]]; then
                     pr_floating_majors+=("${major}")