updating checkout action in hopes that that'll fix release_tests

Author: 9SMTM6

.github/workflows/release-test.yaml

@@ -54,7 +54,7 @@ jobs:
           echo "permit nopass root" >> /etc/doas.conf
       - &checkout
         if: github.event_name == 'workflow_run'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           ref: ${{ github.event.workflow_run.head_sha }}