Update dependency rdf-string to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
rdf-string	^1.3.1 → ^2.0.0

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Release Notes

rubensworks/rdf-string.js (rdf-string)

v2.0.1

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Fixed

• Fix direction parsing looking into literal value

v2.0.0

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BREAKING CHANGES

• Update to rdf-data-factory 2
  This includes a bump to @​rdfjs/types@2.0.0, which requires TypeScript 5 and Node 14+

Added

• Add support for base directions in literals

v1.6.3

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Changed

• Optimize stringToTerm for named nodes

v1.6.2

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Fixed

• Fix incorrect handling of spaces and brackets in quoted triples

v1.6.1

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Fixed

• Include source map files in packed files

v1.6.0

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Changed

• Migrate to @​rdfjs/types

v1.5.0

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Added

• Add support for RDF*

Changed

• Migrate to data factory that supports nested quads

v1.4.2

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Fixed

• Fix issues with incorrect termToString output typings

v1.4.1

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Fixed

• Fix not all termToString overloads being compiled into d.ts

v1.4.0

Compare Source

Changed

• Enable strict TS compilation
• Update DataFactory generics

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