Bump json5, ts-loader and webpack in /js

Removes [json5](https://github.com/json5/json5). It's no longer used after updating ancestor dependencies [json5](https://github.com/json5/json5), [ts-loader](https://github.com/TypeStrong/ts-loader) and [webpack](https://github.com/webpack/webpack). These dependencies need to be updated together.


Removes `json5`

Updates `ts-loader` from 2.0.3 to 9.4.2
- [Release notes](https://github.com/TypeStrong/ts-loader/releases)
- [Changelog](https://github.com/TypeStrong/ts-loader/blob/main/CHANGELOG.md)
- [Commits](https://github.com/TypeStrong/ts-loader/compare/v2.0.3...v9.4.2)

Updates `webpack` from 2.5.1 to 5.75.0
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v2.5.1...v5.75.0)

---
updated-dependencies:
- dependency-name: json5
  dependency-type: indirect
- dependency-name: ts-loader
  dependency-type: direct:development
- dependency-name: webpack
  dependency-type: direct:development
...

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

js/package.json

@@ -1,10 +1,10 @@
 {
     "devDependencies": {
         "license-loader": "^0.5.0",
-        "ts-loader": "^2.0.3",
+        "ts-loader": "^9.4.2",
         "typescript": "^2.3.2",
         "uglifyjs-webpack-plugin": "^1.0.0-beta.2",
-        "webpack": "^2.5.1"
+        "webpack": "^5.75.0"
     },
     "dependencies": {
         "libapps": "github:yudai/libapps#release-hterm-1.70",