ci: bump actions/setup-python from 6 to 7

.github/workflows/backend-tests.yml

@@ -37,7 +37,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: '3.12'
           # Cache pip between runs — big speedup since sentence-transformers
@@ -68,7 +68,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: '3.12'
           cache: 'pip'

.github/workflows/check-docs.yml

@@ -54,7 +54,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           # Matches render.yaml PYTHON_VERSION so AST parsing of source files
           # uses the same language level as production.

.github/workflows/mutation-testing-pr.yml

@@ -158,7 +158,7 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@v7
         with:
           python-version: "3.12"
           cache: pip

.github/workflows/mutation-testing.yml

@@ -229,7 +229,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@v7
         with:
           python-version: "3.12"
           cache: pip

.github/workflows/ruff.yml

@@ -35,7 +35,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: '3.12'
 

.github/workflows/test-quality.yml

@@ -36,7 +36,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: "3.12"
           cache: pip