fix: avoid subshell in PR update loop

Replace pipe to while loop with process substitution to prevent subshell
execution. This allows variable assignments (counters) to persist properly
throughout the entire loop and the workflow completes without exit code 1.

Author: alexyaroshuk

.github/workflows/auto-update-prs.yml

@@ -77,7 +77,7 @@ jobs:
           FAILURE_COUNT=0
           SKIPPED_COUNT=0
 
-          echo "$BRANCHES" | jq -r '.[]' | while IFS= read -r branch; do
+          while IFS= read -r branch; do
             [ -z "$branch" ] && continue
 
             echo ""
@@ -108,7 +108,7 @@ jobs:
               git rebase --abort || true
               ((FAILURE_COUNT++))
             fi
-          done
+          done < <(echo "$BRANCHES" | jq -r '.[]')
 
           echo ""
           echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"