[microsoft/vscode] Bump xterm to fix kitty keyboard protocol (PR #299833)

DRANK

Resolves: https://github.com/microsoft/vscode/issues/295372 and https://github.com/microsoft/vscode/issues/298463 Take in upstream: https://github.com/xtermjs/xterm.js/pull/5737 /cc @meganrogge @Tyriar