build: update cross-repo angular dependencies (21.0.x)

[angular-robot]

This PR contains the following updates:

Package	Type	Update	Change
@angular/ng-dev	devDependencies	digest	19b0de8 -> 9eb95b3
angular/dev-infra	action	digest	fabf48e -> 4ec8405
devinfra	git_override	digest	fabf48e -> 4ec8405

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

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This PR has been generated by Renovate Bot.

[ngbot]

I see that you just added the action: merge label, but the following checks are still failing:
     conflicts with base branch "21.0.x"
     status "mergeability" is failing
If you want your PR to be merged, it has to pass all the CI checks.
If you can't get the PR to a green state due to flakes or broken main, please try rebasing to main and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

[ngbot]

I see that you just added the action: merge label, but the following checks are still failing:
     conflicts with base branch "21.0.x"
     status "mergeability" is failing
If you want your PR to be merged, it has to pass all the CI checks.
If you can't get the PR to a green state due to flakes or broken main, please try rebasing to main and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

[hybrist]

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

• 21.0.x: 7b063de