[vscode] WorkspaceEdit.set can now contain undefined Metadata with 1.86

[rschnekenbu]

update in the signature of WorkspaceEdit.set(uri: Uri, edits: ReadonlyArray<[TextEdit | SnippetTextEdit, WorkspaceEditEntryMetadata | undefined]>): void; and WorkspaceEdit.set(uri: Uri, edits: ReadonlyArray<[NotebookEdit, WorkspaceEditEntryMetadata | undefined]>): void;

see https://github.com/microsoft/vscode/blob/4e52791d3e2ecd20247ee5c774f0fa533299f369/src/vscode-dts/vscode.d.ts#L3955