upd - Updated GH Actions workflow dependencies

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This is to prevent workflow failures that may result from forced usage of
Node.js 24.x LTS.

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Type: upd
Breaking: No
Doc Required: No
Backport Required: No
AI Assisted: No
Part: 1/1

Author: AptiviCEO

.github/workflows/syncmirror.yml

@@ -12,7 +12,7 @@ jobs:
   sync:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: 'true'
           fetch-depth: 0