message: ci: update codecov upload action to 3.1.1
  Deals with the node12 deprecation warning.
diff: @@ -52,7 +52,7 @@ jobs:
  cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
  - name: Upload to codecov.io
  - uses: codecov/codecov-action@f32b3a3741e1053eb607407145bc9619351dc93b # 2.1.0
  + uses: codecov/codecov-action@d9f34f8cd5cb3b3eb79b3e4b5dae3a16df499a70 # 3.1.1
  with:
  files: lcov.info
  fail_ci_if_error: true
  