build: update cross-repo angular dependencies (21.2.x)

[angular-robot]

This PR contains the following updates:

Package	Type	Update	Change
@angular/ng-dev	devDependencies	digest	5853f34 → c78d7a0
angular/dev-infra	action	digest	4b8f9c2 → 9cc4778
devinfra	git_override	digest	4b8f9c2 → 9cc4778

🔡 If you wish to disable git hash updates, add ":disableDigestUpdates" to the extends array in your config.

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[dgp1130]

This PR was merged into the repository. The changes were merged into the following branches:

• 21.2.x: 7045ddf

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