Bump ts-loader from 6.2.2 to 7.0.0

Bumps [ts-loader](https://github.com/TypeStrong/ts-loader) from 6.2.2 to 7.0.0.
- [Release notes](https://github.com/TypeStrong/ts-loader/releases)
- [Changelog](https://github.com/TypeStrong/ts-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/TypeStrong/ts-loader/compare/v6.2.2...v7.0.0)

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

package.json

@@ -47,7 +47,7 @@
         "replace-in-file-webpack-plugin": "^1.0.6",
         "terser-webpack-plugin": "^2.3.5",
         "tfx-cli": "^0.7.11",
-        "ts-loader": "^6.2.2",
+        "ts-loader": "^7.0.0",
         "typescript": "^3.8.3",
         "webpack": "^4.42.1",
         "webpack-cli": "^3.3.11"