ci: Update GitHub Actions cache to v5, refine key, and add restore keys for cargo bins.

.github/workflows/build.yml

@@ -19,9 +19,11 @@ jobs:
       - uses: cargo-bins/cargo-binstall@main
       - run: sudo apt-get install -y tree jq axel
       - uses: extractions/setup-just@v3
-      - uses: actions/cache@v3
+      - uses: actions/cache@v5
         with:
-          key: ${{ runner.os }}-build-dependencies
+          key: ${{ runner.os }}-cargo-bin-${{ hashFiles('justfile') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-bin-
           path: |
             ~/.cargo/bin
       - run: just dependency