Update dependency xregexp to v4.4.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
xregexp (source)	4.2.4 → 4.4.1

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Release Notes

slevithan/xregexp (xregexp)

v4.4.1

Compare Source

• Add browser field to package.json to fix webpack: #​308

v4.4.0

Compare Source

• Upgrade to Unicode 13.0.0
• Add TypeScript definitions and tests #​285 #​286 #​288
• Fix infinite loop in IE11 when used with core-js 3.6.0+ #​300

v4.3.0

Compare Source

• Upgrade to Unicode 12.1.0 : #​278
• Upgrade to @​babel/runtime-corejs3 : #​280

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