ci: actions/checkout v3 -> v4

See also: https://github.com/actions/checkout/blob/v4.1.1/CHANGELOG.md

Author: tony

.github/workflows/docs.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         python-version: ['3.11']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Filter changed file paths to outputs
         uses: dorny/paths-filter@v2.11.1
         id: changes

.github/workflows/tests.yml

@@ -18,7 +18,7 @@ jobs:
       matrix:
         python-version: ['3.9', '3.12']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install poetry
         run: pipx install "poetry==1.7.1"
 
@@ -65,7 +65,7 @@ jobs:
         python-version: ['3.12']
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install poetry
         run: pipx install "poetry==1.7.1"