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-devkit/build-angular	21.0.0-next.5 -> 21.0.0-next.6
@angular-devkit/core	21.0.0-next.5 -> 21.0.0-next.6
@angular-devkit/schematics	21.0.0-next.5 -> 21.0.0-next.6
@angular/build	21.0.0-next.5 -> 21.0.0-next.6
@angular/cli	21.0.0-next.5 -> 21.0.0-next.6
@angular/ssr	21.0.0-next.5 -> 21.0.0-next.6
@schematics/angular	21.0.0-next.5 -> 21.0.0-next.6

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Release Notes

angular/angular-cli (@​angular-devkit/build-angular)

v21.0.0-next.6

Compare Source

@​angular/cli

Commit	Type	Description
58d101d5e	feat	add --json output to ng version
50453fdee	feat	overhaul ng version command output
0922a033f	fix	improve JSON schema parsing for command options

@​schematics/angular

Commit	Type	Description
c119910f4	feat	add AGENTS.md support to ai-config schematic
9dab5780a	fix	add fixture.whenStable in spec files when zoneless apps
e304821d5	fix	make ai-config schematic non-destructive
8ac515699	fix	Out of the box support for PM2
57075a31a	fix	use bracket notation for process.env['pm_id']

@​angular-devkit/build-angular

Commit	Type	Description
acd785afc	fix	mark InjectionToken as pure for improved tree-shaking

@​angular/build

Commit	Type	Description
3e0209d0a	feat	add browserViewport option for vitest browser tests
3b7dabbf1	feat	add advanced coverage options to unit-test builder
65562114c	fix	mark InjectionToken as pure for improved tree-shaking
d0787c11d	fix	provide default excludes for vitest coverage
ac10f323e	fix	relax requirement for files to be in TS compilation

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