ruff

ffc98522 - `ruff server`: Defer notebook cell deletion to avoid an error message (#11864)

`ruff server`: Defer notebook cell deletion to avoid an error message (#11864) ## Summary Fixes https://github.com/astral-sh/ruff-vscode/issues/496. Cells are no longer removed from the notebook index when a notebook gets updated, but rather when `textDocument/didClose` is called for them. This solves an issue where their premature removal from the notebook cell index would cause their URL to be un-queryable in the `textDocument/didClose` handler. ## Test Plan Create and then delete a notebook cell in VS Code. No error should appear.