Increment version of buildjet/cache

.github/workflows/build-commit.yaml

@@ -37,7 +37,7 @@ jobs:
         ref: ${{ inputs.commit || github.sha }}
         fetch-depth: 1
     - uses: ./.github/actions/install
-    - uses: buildjet/cache@v3
+    - uses: buildjet/cache@v4
       with:
         path: ~/target
         key: ${{ runner.os }}-cargo-deps-${{ hashFiles('**/Cargo.lock') }}