internal: Update LSP structs

[radeksimko]

Current Version

0.20.0

Use-cases

LSP structs we use to (de)serialize JSON requests & responses between client and server are outdated and the latest gopls version contains some type changes which would be better to bring in sooner than later, to avoid errors when clients pass something that doesn't match the type exactly.

Proposal

go generate ./internal/protocol/...

[github-actions]

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