Bump Swatinem/rust-cache from 1.4.0 to 2.0.0 (#597)

Bumps [Swatinem/rust-cache](https://github.com/Swatinem/rust-cache) from 1.4.0 to 2.0.0.
- [Release notes](https://github.com/Swatinem/rust-cache/releases)
- [Changelog](https://github.com/Swatinem/rust-cache/blob/master/CHANGELOG.md)
- [Commits](Swatinem/rust-cache@v1.4.0...v2.0.0)

---
updated-dependencies:
- dependency-name: Swatinem/rust-cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/nightly.yml

@@ -34,7 +34,7 @@ jobs:
           override: true
 
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v1.4.0
+        uses: Swatinem/rust-cache@v2.0.0
 
       - name: Cargo test
         uses: actions-rs/cargo@v1.0.3

.github/workflows/rust.yml

@@ -40,7 +40,7 @@ jobs:
           override: true
 
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v1.4.0
+        uses: Swatinem/rust-cache@v2.0.0
 
       - name: Build
         uses: actions-rs/cargo@v1.0.3
@@ -64,7 +64,7 @@ jobs:
             components: rustfmt
 
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v1.4.0
+        uses: Swatinem/rust-cache@v2.0.0
 
       - name: Cargo fmt
         uses: actions-rs/cargo@v1.0.3
@@ -94,7 +94,7 @@ jobs:
           override: true
 
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v1.4.0
+        uses: Swatinem/rust-cache@v2.0.0
 
       - name: Check internal documentation links
         run: RUSTDOCFLAGS="--deny rustdoc::broken_intra_doc_links" cargo doc -vv --workspace --no-deps --document-private-items
@@ -127,7 +127,7 @@ jobs:
           override: true
 
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v1.4.0
+        uses: Swatinem/rust-cache@v2.0.0
 
       - name: Cargo test
         uses: actions-rs/cargo@v1.0.3
@@ -158,7 +158,7 @@ jobs:
             override: true
 
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v1.4.0
+        uses: Swatinem/rust-cache@v2.0.0
 
       - name: Run clippy
         uses: actions-rs/cargo@v1