Bump ts-loader from 6.2.2 to 8.0.18

Bumps [ts-loader](https://github.com/TypeStrong/ts-loader) from 6.2.2 to 8.0.18.
- [Release notes](https://github.com/TypeStrong/ts-loader/releases)
- [Changelog](https://github.com/TypeStrong/ts-loader/blob/master/CHANGELOG.md)
- [Commits](TypeStrong/ts-loader@v6.2.2...v8.0.18)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -90,7 +90,7 @@
     "spectron": "~11.1.0",
     "style-loader": "~2.0.0",
     "tmp": "~0.2.1",
-    "ts-loader": "~6.2.2",
+    "ts-loader": "~8.0.18",
     "vue-devtools": "~5.1.3",
     "vue-eslint-parser": "~7.4.1",
     "vue-jest": "~3.0.7",