Update dependency js-cookie to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
js-cookie	^2.2.1 -> ^3.0.0

ℹ️ Find our documentation at https://github.com/Financial-Times/next/wiki/Renovate.

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Release Notes

js-cookie/js-cookie (js-cookie)

v3.0.5

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• Remove npm version restriction in package.json - #​818

v3.0.4

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• Publish to npmjs.com with package provenance

v3.0.3

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v3.0.2

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v3.0.1

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• Make package.json accessible in export - #​727

v3.0.0

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• Removed defaults in favor of a builder: now to supply an api instance with particular predefined (cookie) attributes there's Cookies.withAttributes(), e.g.:

const api = Cookies.withAttributes({
  path: '/',
  secure: true
})
api.set('key', 'value') // writes cookie with path: '/' and secure: true...

• The attributes that an api instance is configured with are exposed as attributes property; it's an immutable object and unlike defaults cannot be changed to configure the api.
• The mechanism to fall back to the standard, internal converter by returning a falsy value in a custom read converter has been removed. Instead the default converters are now exposed as Cookies.converter, which allows for implementing self-contained custom converters providing the same behavior:

const customReadConverter = (value, name) => {
  if (name === 'special') {
    return unescape(value)
  }
  return Cookies.converter.read(value)
}

• withConverter() no longer accepts a function as argument to be turned into a read converter. It is now required to always pass an object with the explicit type(s) of converter(s):

const api = Cookies.withConverter({
  read: (value, name) => unescape(value)
})

• The converter(s) that an api instance is configured with are exposed as converter property; it's an immutable object and cannot be changed to configure the api.
• Started providing library as ES module, in addition to UMD module. The module field in package.json points to an ES module variant of the library.
• Started using browser field instead of main in package.json (for the UMD variant of the library).
• Dropped support for IE < 10.
• Removed built-in JSON support, i.e. getJSON() and automatic stringifying in set(): use Cookies.set('foo', JSON.stringify({ ... })) and JSON.parse(Cookies.get('foo')) instead.
• Removed support for Bower.
• Added minified versions to package - #​501
• Improved support for url encoded cookie values (support case insensitive encoding) - #​466, #​530
• Expose default path via API - #​541
• Handle falsy arguments passed to getters - #​399
• No longer support Node < 12 when building (LTS versions only)

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