ci: create install_deps step before the rest

I think the deps caching step is crashing with basedpyright, so I'm putting that earlier so it won't be trying to re-cache it after the basedpyright step.

.github/workflows/ci.yml

@@ -34,6 +34,9 @@ jobs:
         id: filter
         with:
           filters: |
+            deps:
+              - 'pyproject.toml'
+              - 'pdm.lock'
             python:
               - '**/*.py'
               - 'storage/fixtures/**/*'
@@ -44,9 +47,26 @@ jobs:
             pre_commit_config:
               - '.pre-commit-config.yaml'
 
-  test:
+  install_deps:
     runs-on: ubuntu-latest
     needs: [changes]
+    if: ${{needs.changes.outputs.deps == 'true' && !github.event.pull_request.draft }}
+    steps:
+      - name: Checkpout repository
+        uses: actions/checkout@v4
+
+      - name: Setup PDM
+        uses: pdm-project/setup-pdm@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          cache: true
+
+      - name: Install dependencies
+        run: pdm install
+
+  test:
+    runs-on: ubuntu-latest
+    needs: [changes, install_deps]
     if: ${{needs.changes.outputs.python == 'true' && !github.event.pull_request.draft }}
     steps:
       - name: Checkpout repository
@@ -107,7 +127,7 @@ jobs:
 
   based_pyright:
     runs-on: ubuntu-latest
-    needs: [changes]
+    needs: [changes, install_deps]
     if: ${{needs.changes.outputs.python == 'true' && !github.event.pull_request.draft }}
     steps:
       - name: Checkout repository