update syntax

Author: parthea

.github/workflows/tests.yaml

@@ -51,7 +51,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: ${DOCS_PYTHON}
+          python-version: ${{ DOCS_PYTHON }}
           cache: 'pip'
       - name: Install nox.
         run: python -m pip install nox
@@ -140,10 +140,10 @@ jobs:
         run: |
           sudo mkdir -p /tmp/workspace/tests/cert/
           sudo chown -R ${USER} /tmp/workspace/
-      - name: Set up Python ${NEWEST_STABLE_PYTHON}
+      - name: Set up Python ${{NEWEST_STABLE_PYTHON}}
         uses: actions/setup-python@v5
         with:
-          python-version: ${NEWEST_STABLE_PYTHON}
+          python-version: ${{NEWEST_STABLE_PYTHON}}
           cache: 'pip'
       - name: Copy mtls files
         run: cp tests/cert/mtls.* /tmp/workspace/tests/cert/