Update dependency @portabletext/toolkit to v2.0.18

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@portabletext/toolkit	2.0.10 -> 2.0.18

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Release Notes

portabletext/toolkit (@​portabletext/toolkit)

v2.0.18

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Patch Changes

• aace023 Thanks @​stipsan! - Update LICENSE year to 2025

v2.0.17

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Bug Fixes

• guard against markDefs being null (#​92) (1f1644a)
• typeError: Marking markDefs as optional to resolve TS error when markDefs array is missing (#​96) (eedd7c7)

v2.0.16

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Bug Fixes

• prevent double spaces in toPlainText when span follows non-span (#​93) (43b963f)

v2.0.15

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Bug Fixes

• deps: update dependency @​portabletext/types to ^2.0.13 (#​85) (e5a0247)

v2.0.14

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Bug Fixes

• deps: update dependency @​portabletext/types to ^2.0.12 (#​78) (eaaa9a1)

v2.0.13

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Bug Fixes

• deps: update dependency @​portabletext/types to ^2.0.11 (#​73) (e85b103)

v2.0.12

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Bug Fixes

• deps: update dependency @​portabletext/types to ^2.0.10 (#​70) (2b8e7f6)

v2.0.11

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Bug Fixes

• deps: update dependency @​portabletext/types to ^2.0.9 (#​65) (83c5700)

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