respect cargo-valgrind's Cargo.lock

Author: molpopgen

.github/workflows/valgrind.yml

@@ -34,7 +34,7 @@ jobs:
       - run: sudo apt-get install -y valgrind
         if: matrix.os == 'ubuntu-latest'
       - run: cargo install cargo-valgrind
-      - name: run cargo valgrind
+      - name: run cargo valgrind --locked
         run: |
             cargo valgrind test --all-targets --all-features
       - name: run cargo valgrind on doc tests