Mitchell 02b58277f4 GH-9369: Fix MutableMessageHeaders for serialization ...

Fixes: #9369 

* Implement `MutableMessageHeaders.readResolve()` to reinstate the instance

**Auto-cherry-pick to `6.3.x` & `6.2.x`**

2024-08-08 17:16:49 +00:00

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main

GH-9369: Fix MutableMessageHeaders for serialization

2024-08-08 17:16:49 +00:00

test

GH-9369: Fix MutableMessageHeaders for serialization

2024-08-08 17:16:49 +00:00