Allow using protobuf version 5 and later

[maffoo]

Fixes #6651

I've updated arg_func_lang_test.py to pass the new or old kwarg to json_format.MessageToDict based on inspecting the function signature, so it works with old and new versions of protobuf. This will unblock upgrades that we need to do internally to work with python 3.12.

[codecov[bot]]

Codecov Report

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

Project coverage is 97.82%. Comparing base (c58a05c) to head (db7f9c2). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6683 +/- ## ========================================== - Coverage 97.82% 97.82% -0.01% ========================================== Files 1074 1074 Lines 92118 92126 +8 ========================================== + Hits 90116 90120 +4 - Misses 2002 2006 +4 ```

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