message: ci: lock cargo-llvm-cov install in script
  Super small change, install cargo-llvm-cov with --locked.
diff: @@ -43,7 +43,7 @@ jobs:
  - name: Install cargo-llvm-cov
  run: |
  rustup component add llvm-tools-preview
  - cargo install cargo-llvm-cov --version 0.3.0
  + cargo install cargo-llvm-cov --version 0.3.0 --locked
  - name: Generate code coverage
  run: |
  