CI: remove rust cache as it cannot work for how we occasionally build the formatter

Due to how caching works on GitHub, it seems this would only work if we build on every push to main rather than building only as needed.

See #123

Author: NathanLovato

.github/workflows/release.yml

@@ -45,12 +45,6 @@ jobs:
         with:
           targets: ${{ matrix.target }}
 
-      # This is a tool that should cache the Rust dependencies and improve build times.
-      - name: Setup cache
-        uses: Swatinem/rust-cache@v2
-        with:
-          key: ${{ matrix.target }}
-
       # This is a toolchain to build cross-platform binaries with rust. We use
       # it for other architectures and OSes than the build runner's.
       - name: Install cross