chore: update GitHub Actions to Node.js 24 compatible versions

- actions/checkout v4 → v6
- astral-sh/setup-uv v5 → v7
- actions/cache v4 → v5

Author: titusz

.github/workflows/tests.yml

@@ -14,9 +14,9 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
-      - uses: astral-sh/setup-uv@v5
+      - uses: astral-sh/setup-uv@v7
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -29,7 +29,7 @@ jobs:
         shell: bash
 
       - name: Cache ONNX model
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ${{ steps.model-cache-dir.outputs.dir }}
           key: ${{ runner.os }}-onnx-model-${{ hashFiles('iscc_sci/utils.py') }}