message: ci: add token secret to make codecov action more stable
  The codecov action can sometimes fail; this change adds the repo codecov token to use by default to help alleviate this.
diff: -# Code coverage generation via cargo-tarpaulin, and uploaded to codecov.
  +# Code coverage generation via cargo-llvm-cov, and uploaded to codecov.
  name: codecov
  @@ -56,3 +56,4 @@ jobs:
  with:
  files: lcov.info
  fail_ci_if_error: true
  + token: ${{ secrets.CODECOV_TOKEN }}
  