ci: Remove unused working-directory config (#645)

Author: tottoto

.github/workflows/CI.yml

@@ -23,7 +23,6 @@ jobs:
     - uses: actions/checkout@v6
     - uses: dtolnay/rust-toolchain@nightly
     - name: cargo doc
-      working-directory: ${{ matrix.subcrate }}
       env:
         RUSTDOCFLAGS: "-D rustdoc::broken_intra_doc_links --cfg docsrs"
       run: cargo doc --all-features --no-deps
@@ -38,7 +37,6 @@ jobs:
         save-if: ${{ github.ref == 'refs/heads/main' }}
     - uses: taiki-e/install-action@cargo-hack
     - name: cargo hack check
-      working-directory: ${{ matrix.subcrate }}
       env:
         RUSTFLAGS: "-D unused_imports -D dead_code -D unused_variables"
       run: cargo hack check --each-feature --no-dev-deps --workspace