Revert "Increase the number of parallel request handlers per connection" (#35435)

Reverts zed-industries/zed#35046

This made the problem worse ;-;

Release Notes:

- N/A
8e7f1899e1Mikayla Maki committed on 7/31/2025, 9:31:29 PM· committed by GitHubparentaea1d48
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