Update dependency neovim to v5.3.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
neovim	5.2.1 -> 5.3.0

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Release Notes

neovim/node-client (neovim)

v5.3.0

Compare Source

• findNvim supports firstMatch parameter which callers can use to stop
  searching after the first valid Nvim is found. #​370
• findNvim now searches various common locations, in addition to $PATH. That
  makes it more useful for GUIs where $PATH is often different than the user's
  shell. #​267
• findNvim supports optional paths and dirs parameters.
• Invalid RPC error now shows the contents of the invalid RPC message. #​404

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