chore(deps): update dependency @angular/core to ^9.1.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@angular/core	peerDependencies	patch	^9.1.5 -> ^9.1.6

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Release Notes

angular/angular

### [`v9.1.6`](https://togithub.com/angular/angular/blob/master/CHANGELOG.md#​916-httpsgithubcomangularangularcompare915916-2020-05-08) [Compare Source](https://togithub.com/angular/angular/compare/9.1.5...9.1.6) ##### Bug Fixes - **compiler-cli**: Revert "fix(compiler-cli): fix case-sensitivity issues in NgtscCompilerHost ([#​36968](https://togithub.com/angular/angular/issues/36968))" ([#​37003](https://togithub.com/angular/angular/issues/37003))

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