[Snyk] Security upgrade highcharts from 7.1.1 to 9.0.0#17

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-2403c91d03640ec965c274966bf67de4

+4-4

Commits on May 7, 2021

fix: package.json & package-lock.json to reduce vulnerabilities
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