remove rust cache key, as it wasn't working

Author: mnutt

.github/workflows/build-deb.yml

@@ -23,8 +23,6 @@ jobs:
 
     - name: Cache Rust dependencies
       uses: Swatinem/rust-cache@v2
-      with:
-        shared-key: ${{ matrix.varnish }}
 
     - name: Install Varnish from packagecloud
       run: |

.github/workflows/test.yml

@@ -21,8 +21,6 @@ jobs:
 
     - name: Cache Rust dependencies
       uses: Swatinem/rust-cache@v2
-      with:
-        shared-key: ${{ matrix.varnish }}
 
     - name: Install Varnish from packagecloud
       run: |