fix test client upload

.github/workflows/rust.yml

@@ -85,7 +85,7 @@ jobs:
       - uses: actions/upload-artifact@v2
         with:
           name: test_client
-          path: test_client/target/x86_64-unknown-linux-musl/release/test_client
+          path: target/x86_64-unknown-linux-musl/release/test_client
 
   msrv:
     name: Check MSRV
@@ -100,4 +100,4 @@ jobs:
       - uses: Swatinem/rust-cache@v1
       - uses: actions-rs/cargo@v1
         with:
-          command: check
\ No newline at end of file
+          command: check