ci: pin setup-uv to v8.3.2 (no moving v8 tag exists)

astral-sh/setup-uv publishes moving major tags only up to v7; the v8 line
exists solely as exact releases, so `@v8` fails to resolve ("unable to find
version v8") and blocked every workflow run. Pin to the latest v8 release,
preserving the Node-24 intent of the earlier majors bump.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Author: claude

.github/workflows/claude-code.yml

@@ -37,7 +37,7 @@ jobs:
           python-version: '3.11'
 
       - name: Setup uv
-        uses: astral-sh/setup-uv@v8
+        uses: astral-sh/setup-uv@v8.3.2
         with:
           version: "latest"
 

.github/workflows/marimo-pages.yml

@@ -29,7 +29,7 @@ jobs:
           python-version: "3.11"
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v8
+        uses: astral-sh/setup-uv@v8.3.2
 
       - name: Install dependencies
         run: |

.github/workflows/python-publish.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           python-version: '3.11'
 
-      - uses: astral-sh/setup-uv@v8
+      - uses: astral-sh/setup-uv@v8.3.2
         with:
           version: "latest"