Upgrade action versions

Author: tpoomlmly

.github/workflows/ci.yml

@@ -9,11 +9,11 @@ jobs:
       FLAKE8: venv/bin/flake8
       MYPY: venv/bin/mypy
     steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python 3.8
-      uses: actions/setup-python@v3
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.13
+      uses: actions/setup-python@v5
       with:
-        python-version: 3.8
+        python-version: 3.13
     - name: Set up virtualenv
       run: python -m venv venv
     - name: Install dependencies
@@ -31,13 +31,13 @@ jobs:
     runs-on: ubuntu-latest
     needs: lint
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
-    - name: Set up Python 3.8
-      uses: actions/setup-python@v4
+    - name: Set up Python 3.13
+      uses: actions/setup-python@v5
       with:
-        python-version: "3.8"
+        python-version: "3.13"
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip build