ci: use latest pinned version of uv in ci

Author: Bee-Mar

.github/workflows/workflow.yaml

@@ -31,7 +31,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v8
+        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
         with:
           version: 0.8.19
           python-version: ${{ matrix.python-version }}
@@ -170,7 +170,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v8
+        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
         with:
           version: 0.8.19
           python-version: ${{ matrix.python-version }}