ci: update GitHub Actions workflow actions

Author: tatakaisun

.github/workflows/check-docs.yaml

@@ -10,7 +10,7 @@ jobs:
     outputs:
       docs_changes: ${{ steps.check_file_changed.outputs.changed }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
         with:
           # Checkout as many commits as needed for the diff
           fetch-depth: 2

.github/workflows/ui.yaml

@@ -13,8 +13,8 @@ jobs:
   test-ui:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
         with:
           node-version: 20
       - name: Cache node modules