There is a vulnerability in highlight.js 9.18.1,upgrade recommended

[QiAnXinCodeSafe]

echarts-doc/package-lock.json

Lines 4410 to 4413 in 47f5c06

	"highlight.js": {
	"version": "9.18.1",
	"resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-9.18.1.tgz",
	"integrity": "sha512-OrVKYz70LHsnCgmbXctv/bfuvntIKDz177h0Co37DQ5jamGZLVmoCVMtjMtNZY3X9DrCcKfklHPNeA0uPZhSJg=="

CVE-2020-26237

Recommended upgrade version：9.18.2