chore(ci): upgrade checkout to v4

Author: dizer-ti

.github/workflows/gh-pages.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: "ubuntu-latest"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
           submodules: recursive

.github/workflows/test.yaml

@@ -15,7 +15,7 @@ jobs:
         py: [ "3.10", "pypy3.10" ]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive