chore(deps): update actions/setup-python action to v6 (#1407)

Author: renovate-bot

.github/workflows/integration-tests-against-emulator-with-regular-session.yaml

@@ -19,7 +19,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.13
       - name: Install nox

.github/workflows/integration-tests-against-emulator.yaml

@@ -19,7 +19,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.13
       - name: Install nox

.github/workflows/mock_server_tests.yaml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.13
       - name: Install nox

.github/workflows/presubmit.yaml

@@ -15,7 +15,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.13
       - name: Install nox
@@ -33,7 +33,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{matrix.python}}
       - name: Install nox