AMBARI-25842 : Update Angular version in Ambari .

[vishalsuvagia]

Issue: Angular version in Ambari admin-web is not available.

Changes: Updated angular version to the available version.

Testing: Validated changes on local machine.

What changes were proposed in this pull request?

(Please fill in changes proposed in this fix)

How was this patch tested?

(Please explain how this patch was tested. Ex: unit tests, manual tests) (If this patch involves UI changes, please attach a screen-shot; otherwise, remove this)

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