chore: update action versions

Signed-off-by: Akhil Narang <me@akhilnarang.dev>

.github/workflows/server-tests-mariadb.yml

@@ -62,10 +62,10 @@ jobs:
 
     steps:
       - name: Clone
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.14'
 
@@ -78,7 +78,7 @@ jobs:
           fi
 
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 24
           check-latest: true
@@ -149,7 +149,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Download artifacts
         uses: actions/download-artifact@v4