Bump astral-sh/setup-uv to v8.2.0

Update CI workflow to use astral-sh/setup-uv@v8.2.0 instead of v6 in .github/workflows/ci.yml. Replaces three occurrences to ensure the workflow uses the newer setup-uv release.

Author: FeodorFitsner

.github/workflows/ci.yml

@@ -224,7 +224,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Setup uv
-        uses: astral-sh/setup-uv@v6
+        uses: astral-sh/setup-uv@v8.2.0
 
       - name: Get Flutter version from ".fvmrc"
         uses: kuhnroyal/flutter-fvm-config-action/config@v3
@@ -517,7 +517,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Setup uv
-        uses: astral-sh/setup-uv@v6
+        uses: astral-sh/setup-uv@v8.2.0
 
       - name: Get Flutter version from ".fvmrc"
         uses: kuhnroyal/flutter-fvm-config-action/config@v3
@@ -912,7 +912,7 @@ jobs:
           fetch-depth: 0
 
       - name: Setup uv
-        uses: astral-sh/setup-uv@v6
+        uses: astral-sh/setup-uv@v8.2.0
 
       - name: Setup Flutter
         uses: kuhnroyal/flutter-fvm-config-action/setup@v3