ci: isolate uv cache per Python matrix job

Author: simonsysun

.github/workflows/test.yml

@@ -14,10 +14,13 @@ jobs:
         python-version: ["3.11", "3.12", "3.13", "3.14"]
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-      - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
           python-version: ${{ matrix.python-version }}
+      - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache-suffix: py${{ matrix.python-version }}
       - name: Install dependencies
         run: uv sync --dev
       - name: Run tests