Fix pdm install step.

Author: koval

.github/workflows/autorelease.yml

@@ -20,6 +20,7 @@ jobs:
         uses: pdm-project/setup-pdm@v3
         with:
           python-version: ${{ matrix.python-version }}
+          version: 2.20.1
 
       - name: Install dependencies
         run: pdm install -dG release

.github/workflows/publish.yml

@@ -15,6 +15,7 @@ jobs:
         uses: pdm-project/setup-pdm@v3
         with:
           python-version: ${{ matrix.python-version }}
+          version: 2.20.1
 
       - name: Publish package distributions to PyPI
         run: pdm publish

.github/workflows/python-linters.yml

@@ -18,6 +18,7 @@ jobs:
         uses: pdm-project/setup-pdm@v3
         with:
           python-version: ${{ matrix.python-version }}
+          version: 2.20.1
 
       - name: Install dependencies
         run: |

.github/workflows/python-tests.yml

@@ -19,6 +19,7 @@ jobs:
         uses: pdm-project/setup-pdm@v3
         with:
           python-version: ${{ matrix.python-version }}
+          version: 2.20.1
 
       - name: Install dependencies
         run: |