fix: upgrade GitHub Actions to Node.js 24 compatible versions

Author: urish

.github/workflows/docs.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 

.github/workflows/gds.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: recursive