Pin setup-uv to v9.0.0

There is no floating v9 tag — setup-uv publishes moving majors only up to
v7, so v9 failed to resolve and the lint job never started.

.github/workflows/build-docs.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: astral-sh/setup-uv@v9
+      - uses: astral-sh/setup-uv@v9.0.0
       - run: uv sync --group dev
       - run: uv run zensical build
       - uses: actions/configure-pages@v5

.github/workflows/build-publish-slim.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: astral-sh/setup-uv@v9
+      - uses: astral-sh/setup-uv@v9.0.0
         with:
           enable-cache: true
       - name: Set up Python

.github/workflows/build-publish.yml

@@ -12,7 +12,7 @@ jobs:
     if: ${{ github.event_name == 'workflow_dispatch' || github.event.workflow_run.conclusion == 'success' }}
     steps:
       - uses: actions/checkout@v4
-      - uses: astral-sh/setup-uv@v9
+      - uses: astral-sh/setup-uv@v9.0.0
         with:
           enable-cache: true
       - name: Set up Python

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: astral-sh/setup-uv@v9
+      - uses: astral-sh/setup-uv@v9.0.0
         with:
           enable-cache: true
       - name: Set up Python
@@ -52,7 +52,7 @@ jobs:
       HF_TOKEN: ${{ secrets.HF_TOKEN }}
     steps:
       - uses: actions/checkout@v4
-      - uses: astral-sh/setup-uv@v9
+      - uses: astral-sh/setup-uv@v9.0.0
         with:
           enable-cache: true
       - name: Set up Python