Bump xterm from 4.10.0 to 4.12.0 (#2895)

Bumps [xterm](https://github.com/xtermjs/xterm.js) from 4.10.0 to 4.12.0.
- [Release notes](https://github.com/xtermjs/xterm.js/releases)
- [Commits](https://github.com/xtermjs/xterm.js/compare/4.10.0...4.12.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -372,7 +372,7 @@
     "webpack-dev-server": "^3.11.0",
     "webpack-node-externals": "^1.7.2",
     "what-input": "^5.2.10",
-    "xterm": "^4.10.0",
+    "xterm": "^4.12.0",
     "xterm-addon-fit": "^0.4.0"
   }
 }