Added rustc version to hash for build caches

Author: Kixiron

.github/workflows/ci.yml

@@ -36,7 +36,9 @@ jobs:
         uses: actions/cache@v1
         with:
           path: target
-          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+          key: ${{ runner.os }}-cargo-build-target-${{ steps.rustc.outputs.version }}-${{ hashFiles('**/Cargo.lock') }}
+          restore-key: |
+            ${{ runner.os }}-cargo-build-target-${{ steps.rustc.outputs.version }}-
 
       - name: Install stable Rust
         run: rustup update stable && rustup default stable