Build: Bump flot from 0.8.3 to 4.2.6

Bumps [flot](https://github.com/flot/flot) from 0.8.3 to 4.2.6.
- [Release notes](https://github.com/flot/flot/releases)
- [Changelog](https://github.com/flot/flot/blob/master/CHANGELOG.md)
- [Commits](flot/flot@v0.8.3...v4.2.6)

---
updated-dependencies:
- dependency-name: flot
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -43,7 +43,7 @@
     "datatables.net": "~1.13.11",
     "dompurify": "^3.2.4",
     "fast-json-patch": "github:wet-boew/JSON-Patch#wb1.0+1.1.4",
-    "flot": "0.8.3",
+    "flot": "4.2.6",
     "jquery": "2.2.4",
     "jquery-validation": "1.21.0",
     "jsonpointer.js": "^0.4.0",