fix: document version reset on textDocument/didSave (#2695)

Fixes #2375

This PR fixes an issue where the document version is reset to `0` on
`textDocument/didSave`.

It is not documented in the LSP that the version should reset, see:
https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_didSave.

This caused a document version mismatch in editors when applying code
actions (for example see
zed-industries/zed#31014).

Author: JoeRobich

src/OmniSharp.LanguageServerProtocol/Handlers/OmniSharpTextDocumentSyncHandler.cs

@@ -154,8 +154,6 @@ await _bufferHandler.Handle(new UpdateBufferRequest()
                     FileName = Helpers.FromUri(notification.TextDocument.Uri),
                     Buffer = notification.Text
                 });
-
-                _documentVersions.Reset(notification.TextDocument);
             }
             return Unit.Value;
         }