Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/test_suite.yml

@@ -18,7 +18,7 @@ jobs:
 #    runs-on: ubuntu-latest
 #    steps:
 #    - name: checkout
-#      uses: actions/checkout@v5
+#      uses: actions/checkout@v6
 #
 #    - name: setup node
 #      uses: actions/setup-node@v1
@@ -42,7 +42,7 @@ jobs:
 #    needs: [lintcode]
 #    steps:
 #    - name: checkout
-#      uses: actions/checkout@v5
+#      uses: actions/checkout@v6
 #
 #    - name: setup node
 #      uses: actions/setup-node@v1
@@ -65,7 +65,7 @@ jobs:
 #    needs: [lintcode,lintstyle]
 #    steps:
 #    - name: checkout
-#      uses: actions/checkout@v5
+#      uses: actions/checkout@v6
 #
 #    - name: setup node
 #      uses: actions/setup-node@v1
@@ -90,7 +90,7 @@ jobs:
 
       # CHECKOUTS
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # CACHING
       - name: Install Meteor
@@ -147,7 +147,7 @@ jobs:
     needs: [tests]
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Download coverage
         uses: actions/download-artifact@v6