Merge pull request #54 from palfrey/renovate/swatinem-rust-cache-2.x

Update Swatinem/rust-cache action to v2

Author: renovate[bot]

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
           profile: minimal
           toolchain: ${{ matrix.rust }}
           components: rustfmt
-      - uses: Swatinem/rust-cache@v1
+      - uses: Swatinem/rust-cache@v2
       - name: Check formatting
         uses: actions-rs/cargo@v1
         with: