chore(deps): bump xterm from 3.14.5 to 4.9.0

[dependabot-preview]

Bumps xterm from 3.14.5 to 4.9.0.

Release notes

Sourced from xterm's releases.

4.9.0

📦 API

• Add number support to fontWeight and fontWeightBold options (#3062) via @IllusionMH, this now matches the types that the CSS style supports.
• Support optional dispose function on ILink (#3073) via @Tyriar, this allows consumers to be notified when links are no longer needed which was difficult to observe before.

🐞 Bug fixes

• Fix renderer pausing when Terminal.open is called during an animation (#3008) via @andrew-schlackman
• Use document role instead of list for the terminal (#3020) via @Tyriar
• Constructor options are now validated just like when using setOption (#3064) via @IllusionMH
• Fix rendering of multi-line selection when only top row is visible (#3081) via @Tyriar
• Fix first/last line of selection sometimes not rendering with the canvas renderer (#3082) via @Tyriar

📝 Documentation and internal improvements

• Remove the no longer supported Dockerfile from the repo (#3026) via @Tyriar
• Update to TypeScript 4 (#3059) via @Tyriar

🛑 Breaking changes

• getOption('fontWeight') and getOption('fontWeightBold') now returns string | number instead of string:

  // before 4.9.0
  const weight: string = term.getOption('fontWeight');
  // after 4.9.0
  const weight: string | number = term.getOption('fontWeight');

  This change accepted as the impact on consumers should be minimal due to the low usage of the API.

🎉 New real-world use cases

• Repl.it (#3021) via @sergeichestakov
• TeleType (#3040) via @akshaykmr
• Intervue (#3046) via @Intervue

---

📥 Addons

xterm-addon-serialize

• Fix CJK handling (#3067) via @mmis1000

xterm-addon-webgl

• Expose WebglAddon.clearTextureAtlas API (#3075) via @Tyriar, this is useful to completely clear the atlas when corruption may have happened (eg. when canvas textures are lost after system sleep/resume).
• Fix rendering of multi-line selection when only top row is visible (#3081) via @Tyriar

Commits

• 3504e2e Merge pull request #3084 from Tyriar/release490
• 6c22e3d v4.9.0
• 33bf765 Merge pull request #3067 from mmis1000/fix/addon-serialize-cjk-handling
• d960793 Merge pull request #3062 from IllusionMH/numeric-fontWeight-3051
• 4975f38 Use assert over expect
• 4649ad7 Merge pull request #3077 from xtermjs/dependabot/npm_and_yarn/typescript-esli...
• a425c32 Bump @typescript-eslint/eslint-plugin from 3.10.1 to 4.0.0
• c77025b Merge pull request #3079 from xtermjs/dependabot/npm_and_yarn/eslint-7.8.1
• c6abc85 Merge pull request #3081 from Tyriar/3069_multiline_selection
• 710223a Merge pull request #3082 from Tyriar/3080_selection_canvas
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #191.