Bump highcharts from 11.4.7 to 11.4.8 (#926)

Bumps [highcharts](https://github.com/highcharts/highcharts-dist) from 11.4.7 to 11.4.8.
- [Commits](highcharts/highcharts-dist@v11.4.7...v11.4.8)

---
updated-dependencies:
- dependency-name: highcharts
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Barry Pollard <barry_pollard@hotmail.com>

Author: dependabot[bot]

package-lock.json

@@ -33,7 +33,7 @@
   "devDependencies": {
     "ejs": "3.1.10",
     "fs-extra": "11.2.0",
-    "highcharts": "11.4.7",
+    "highcharts": "11.4.8",
     "node-fetch": "3.3.2",
     "recursive-readdir": "2.2.3",
     "run-script-os": "1.1.6",