Try not caching journey test dependencies

Author: EliahKagan

.github/workflows/ci.yml

@@ -123,7 +123,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
-      - uses: Swatinem/rust-cache@v2
       - uses: extractions/setup-just@v2
       - name: Run journey tests
         run: just ci-journey-tests