Update github actions to run on node 20

See https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/

Author: lucc

.github/workflows/check.yml

@@ -16,10 +16,10 @@ jobs:
           - poetry build
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
 
       - name: Install poetry
         run: |

.github/workflows/test.yml

@@ -14,10 +14,10 @@ jobs:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}