chore(deps): update dependency ng-packagr to v21

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ng-packagr	^20.1.0 -> ^21.0.0

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Release Notes

ng-packagr/ng-packagr (ng-packagr)

v21.0.0

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⚠ BREAKING CHANGES

• TypeScript versions older than 5.9 are no longer supported.
• The javascriptEnabled option for Less is no longer supported. Projects relying on inline JavaScript within Less files will need to refactor their stylesheets to remove this dependency.

Bug Fixes

• drop support for TypeScript 5.8 (7b48224)
• remove deprecated javascriptEnabled option for Less (d57278d)

Features

• write the types in types directory (7a5e8fb)
• add support for Angular version 21 (ed70e23)

v20.3.2

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Bug Fixes

• ensure deterministic ordering of 'exports' field (952ca64), closes #​3175

v20.3.1

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Performance

• reduce memory usage for multiple entry-points (non-watch) (e063368), closes #​3168

v20.3.0

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• No visible changes

v20.2.0

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Features

• Add support for TypeScript 5.9

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