Use ubuntu-latest in github actions.

Author: koval

.github/workflows/autorelease.yml

@@ -8,18 +8,22 @@ jobs:
   autorelease:
     if: github.event.pull_request.merged == true
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ '3.8.16' ]
+
     steps:
       - uses: actions/checkout@v3
 
       - name: Set up python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: ${{ matrix.python-version }}
       - name: Set up PDM
         uses: pdm-project/setup-pdm@v3
         with:
-          python-version: 3.8
+          python-version: ${{ matrix.python-version }}
           version: 2.20.1
 
       - name: Install dependencies

.github/workflows/publish.yml

@@ -6,14 +6,26 @@ on:
 
 jobs:
   build-and-publish:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ '3.8.16' ]
+
     permissions:
       id-token: write
+
     steps:
       - uses: actions/checkout@v3
+
+      - name: Set up python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
       - name: Set up PDM
         uses: pdm-project/setup-pdm@v3
         with:
+          python-version: ${{ matrix.python-version }}
           version: 2.20.1
 
       - name: Publish package distributions to PyPI