Merge pull request #124 from kyoto7250/renovate/actions-cache-4.x

Update actions/cache action to v4

Author: kyoto7250

.github/workflows/ci.yml

@@ -36,17 +36,17 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Cache cargo registry
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.cargo/registry
           key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
       - name: Cache cargo index
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.cargo/git
           key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
       - name: Cache cargo build
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: target
           key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}