fix cache action (#12371)

the workspace config isn't needed now that we have cargo.toml in the base of the repo

Author: alex

.github/actions/cache/action.yml

@@ -20,4 +20,3 @@ runs:
     - uses: Swatinem/rust-cache@f0deed1e0edfc6a9be95417288c0e1099b1eeec3  # v2.7.7
       with:
         key: ${{ steps.normalized-key.outputs.key }}-3
-        workspaces: "./src/rust/ -> target"