Update CodeMirror

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@codemirror/lang-markdown	6.2.0 -> 6.2.1
@codemirror/lint	6.4.1 -> 6.4.2
@codemirror/view	6.18.0 -> 6.19.0

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Release Notes

codemirror/lang-markdown (@​codemirror/lang-markdown)

### [`v6.2.1`](https://togithub.com/codemirror/lang-markdown/blob/HEAD/CHANGELOG.md#621-2023-09-14) [Compare Source](https://togithub.com/codemirror/lang-markdown/compare/6.2.0...6.2.1) ##### Bug fixes Make `insertNewlineContinueMarkup` and `deleteMarkupBackward` use tabs for indentation when appropriate.

codemirror/lint (@​codemirror/lint)

### [`v6.4.2`](https://togithub.com/codemirror/lint/blob/HEAD/CHANGELOG.md#642-2023-09-14) [Compare Source](https://togithub.com/codemirror/lint/compare/6.4.1...6.4.2) ##### Bug fixes Make sure scrolling diagnostic into view in the panel works when the editor is scaled.

codemirror/view (@​codemirror/view)

### [`v6.19.0`](https://togithub.com/codemirror/view/blob/HEAD/CHANGELOG.md#6190-2023-09-14) [Compare Source](https://togithub.com/codemirror/view/compare/6.18.1...6.19.0) ##### Bug fixes Make sure the drop cursor is properly cleaned up even when another extension handles the drop event. Fix a crash related to non-inclusive replacing block decorations. ##### New features The new `EditorView.domEventObservers` (and the corresponding option to view plugins) allows you to register functions that are always called for an event, regardless of whether other handlers handled it. ### [`v6.18.1`](https://togithub.com/codemirror/view/blob/HEAD/CHANGELOG.md#6181-2023-09-11) [Compare Source](https://togithub.com/codemirror/view/compare/6.18.0...6.18.1) ##### Bug fixes Fix an issue where the editor duplicated text when the browser moved content into the focused text node on composition. Make sure `widgetMarker` is called for gutters on lines covered by a block replace decoration. Fix an issue where the cursor could be shown in a position that doesn't allow a cursor when the selection is in a block widget.

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