Bump for rust cache v2

This just updates the rust cache actions version

.github/workflows/rust.yml

@@ -14,15 +14,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: Swatinem/rust-cache@v1
+      - uses: Swatinem/rust-cache@v2
       - name: Check Rita and Rita Exit x86
         run: cargo check --all
   test:
     needs: check
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: Swatinem/rust-cache@v1
+      - uses: Swatinem/rust-cache@v2
       - name: Run Rita and Rita Exit tests
         run: RUST_TEST_THREADS=1 cargo test --verbose --all
   rustfmt:
@@ -37,47 +37,47 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: Swatinem/rust-cache@v1
+      - uses: Swatinem/rust-cache@v2
       - name: Check for Clippy lints
         run: rustup component add clippy && cargo clippy --all --all-targets --all-features -- -D warnings
   audit:
     needs: check
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: Swatinem/rust-cache@v1
+      - uses: Swatinem/rust-cache@v2
       - name: Run Cargo Audit
         run: cargo install cargo-audit && cargo audit
   cross-mips:
     needs: test
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: Swatinem/rust-cache@v1
+      - uses: Swatinem/rust-cache@v2
       - name: Cross test mips
         run: cargo install cross && cross test --target mips-unknown-linux-musl --verbose -- --test-threads=1
   cross-mipsel:
     needs: test
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: Swatinem/rust-cache@v1
+      - uses: Swatinem/rust-cache@v2
       - name: Cross test mipsel
         run: cargo install cross && cross test --target mipsel-unknown-linux-musl --verbose -- --test-threads=1
   cross-aarch64:
     needs: test
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: Swatinem/rust-cache@v1
+      - uses: Swatinem/rust-cache@v2
       - name: Cross test aarch64
         run: cargo install cross && cross test --target aarch64-unknown-linux-musl --verbose -- --test-threads=1
   cross-armv7:
     needs: test
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: Swatinem/rust-cache@v1
+      - uses: Swatinem/rust-cache@v2
       - name: Cross test armv7
         run: cargo install cross && cross test --target armv7-unknown-linux-musleabihf --verbose -- --test-threads=1
   integration-test-five-nodes: