fix(ci/release): Pass python version as a string

Signed-off-by: Luka Peschke <[email protected]>

.github/workflows/release.yml

@@ -12,10 +12,10 @@ jobs:
       contents: write
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python ${{ matrix.python-version }}
+    - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.10
+        python-version: '3.10'
 
     - name: Install dependencies
       run: |