Upgrade Angular dependencies to version to 21.2.11#7

Ashwini-SF5049 wants to merge 2 commits intoSyncfusionExamples:masterSyncfusionExamples/getting-started-with-the-angular-split-button-component:masterfrom

Ashwini-SF5049:EJ2-1234-splitAshwini-SF5049/getting-started-with-the-angular-split-button-component:EJ2-1234-splitCopy head branch name to clipboard