build: update cross-repo angular dependencies to v21.0.0-next.6 (main)

[angular-robot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@angular/common (source)	21.0.0-next.5 -> 21.0.0-next.6
@angular/compiler (source)	21.0.0-next.5 -> 21.0.0-next.6
@angular/compiler-cli (source)	21.0.0-next.5 -> 21.0.0-next.6
@angular/core (source)	21.0.0-next.5 -> 21.0.0-next.6
@angular/forms (source)	21.0.0-next.5 -> 21.0.0-next.6
@angular/localize	21.0.0-next.5 -> 21.0.0-next.6
@angular/platform-browser (source)	21.0.0-next.5 -> 21.0.0-next.6
@angular/platform-browser-dynamic (source)	21.0.0-next.5 -> 21.0.0-next.6
@angular/platform-server (source)	21.0.0-next.5 -> 21.0.0-next.6
@angular/router (source)	21.0.0-next.5 -> 21.0.0-next.6

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Release Notes

angular/angular (@​angular/common)

v21.0.0-next.6

Compare Source

Breaking Changes

elements

• Fix signal input getter behavior in custom elements.

  Before this change, signal inputs in custom elements required function calls to access their values (elementRef.newInput()), while decorator inputs were accessed directly (elementRef.oldInput). This inconsistency caused confusion and typing difficulties.

  The getter behavior has been standardized so signal inputs can now be accessed directly, matching the behavior of decorator inputs:

  Before:

  • Decorator Input: elementRef.oldInput
  • Signal Input: elementRef.newInput()

  After:

  • Decorator Input: elementRef.oldInput
  • Signal Input: elementRef.newInput

common

Commit	Type	Description
99c5269ee8	feat	Support of optional keys for the KeyValue pipe (#​48814)

compiler

Commit	Type	Description
159be56709	fix	recover template literals with broken expressions (#​64150)

core

Commit	Type	Description
1cb16fddb5	fix	Fixes animations in conjunction with content projection (#​63776)
8a0c9ca8be	fix	prevents unintended early termination of leave animations and hoisting (#​64088)

elements

Commit	Type	Description
be0455adda	fix	return value on signal input getter (#​62113)

migrations

Commit	Type	Description
51a0b59389	fix	handle shorthand property declarations in NgModule (#​64160)
31bc9e4111	fix	skip migration for inputs with 'this' references (#​64142)

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