msgpack and cython updates (master)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.80%. Comparing base (c9c5b4d) to head (03e9642).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8136 +/- ## ======================================= Coverage 83.79% 83.80% ======================================= Files 67 67 Lines 12046 12046 Branches 2185 2185 ======================================= + Hits 10094 10095 +1 + Misses 1361 1359 -2 - Partials 591 592 +1 ```

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