fix(ci): use astral-sh/setup-uv@v5 (v8 short tag does not exist yet)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: justinmerrell

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: astral-sh/setup-uv@v8
+      - uses: astral-sh/setup-uv@v5
         with:
           enable-cache: true
 

.github/workflows/release.yml

@@ -32,7 +32,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: astral-sh/setup-uv@v8
+      - uses: astral-sh/setup-uv@v5
         with:
           enable-cache: true