upgrade to latest stable angular release

[ghost]

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• Commit: 991192b48d4ec51fcb2ac2de77e5d54d1d38488b
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• Commit: 6a836d3ed89445cba556d171ad10ec669afc0eb3
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• Commit: 669b6d631683b7c99128a1fef183c313292abfd0
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