chore(deps): update dependency @urql/core to v6

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This PR contains the following updates:

Package	Change	Age	Confidence
@urql/core (source)	^2.4.0 || ^3.0.0 || ^4.0.0 || ^5.0.0 -> ^2.4.0 || ^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0

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Release Notes

urql-graphql/urql (@​urql/core)

v6.0.1

Patch Changes

• Use nullish coalescing for preferGetMethod and preferGetForPersistedQueries so that false is kept if set
  Submitted by @​dargmuesli (See #​3812)

v6.0.0

Major Changes

• By default leverage GET for queries where the query-string + variables comes down to less than 2048 characters.
  When upgrading it's important to see whether your server supports GET, if it doesn't ideally adding support for it
  or alternatively setting preferGetMethod in the createClient method as well as preferGetForPersistedQueries for
  the persisted exchange to false
  Submitted by @​JoviDeCroock (See #​3789)

Minor Changes

• Fix type definition for GraphQLRequestParams to make variables field optional if and only if all fields are optional or nullish
  Submitted by @​arkandias (See #​3807)

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