ci: pin unpinned python installs to 3.12 (3.14 breaks pydantic-core build)

Author: prassanna-ravishankar

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
           version: "latest"
 
       - name: Set up Python
-        run: uv python install
+        run: uv python install 3.12
 
       - name: Install dependencies
         run: uv sync --all-groups
@@ -81,7 +81,7 @@ jobs:
           version: "latest"
 
       - name: Set up Python
-        run: uv python install
+        run: uv python install 3.12
 
       - name: Install dependencies
         run: uv sync --all-groups
@@ -102,7 +102,7 @@ jobs:
           version: "latest"
 
       - name: Set up Python
-        run: uv python install
+        run: uv python install 3.12
 
       - name: Install dependencies
         run: uv sync
@@ -139,7 +139,7 @@ jobs:
           version: "latest"
 
       - name: Set up Python
-        run: uv python install
+        run: uv python install 3.12
 
       - name: Create virtual environment
         run: uv venv