build: 📦 update angular-cli monorepo to v21.2.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@angular-devkit/build-angular	21.2.0 → 21.2.1
@angular-devkit/core	21.2.0 → 21.2.1
@angular-devkit/schematics	21.2.0 → 21.2.1
@schematics/angular	21.2.0 → 21.2.1

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Release Notes

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

v21.2.1

Compare Source

@​angular/cli

Commit	Type	Description
ae4c28d00	fix	correct dev dependency detection logic in ng add
465073bc1	fix	disable npm update notifier in package manager host
36270634f	fix	ensure group members are updated to targeted version
d87dba6af	fix	ignore unknown files when formatting schematic changes

@​schematics/angular

Commit	Type	Description
72d466aa0	fix	prevent adding test dependencies when minimal option is enabled

@​angular-devkit/build-angular

Commit	Type	Description
0019d1c8e	fix	update copy-webpack-plugin to v14.0.0

@​angular/build

Commit	Type	Description
6ad860863	fix	bundle polyfills to preserve execution order in dev server
d17397375	fix	conditionally allow vi.mock for non-relative imports
0d49f86ed	fix	resolve style include paths relative to ng-package.json in unit-test builder
584f6a2d9	fix	treat empty browsers array as undefined in unit-test builder
6699cdc9b	perf	fix memory leak in ng serve with i18n

@​angular/ssr

Commit	Type	Description
43a9dfa66	fix	improve header validation logic
dee3717b3	fix	introduce DI token to signal route discovery process

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