chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
         release-type: node
         package-name: nodebb-plugin-total-vote-count
     # The logic below handles the npm publication:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       # these if statements ensure that a publication only occurs when
       # a new release is created:
       if: ${{ steps.release.outputs.release_created }}

.github/workflows/test.yml

@@ -65,12 +65,12 @@ jobs:
         ports:
           - 7700:7700
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           repository: NodeBB/NodeBB
           ref: ${{ matrix.nodebb }}
           path: nodebb
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           path: tested-plugin
       - name: Prepare NodeBB package.json