fix: #3601406 Switch Highcharts source from code.highcharts.com to jsdelivr.

Mohammad Khamashrequested to merge
issue/charts-3601406:3601406-switch-code.highcharts.com-to into 5.0.x
  • Switch Highcharts source from code.highcharts.com to jsdelivr
  • Bump highcharts js from 11.1 to 12.5.
  • Upadte README.md installation

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