fix(deps): update dependency @angular/cdk to v8.1.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@angular/cdk	dependencies	patch	8.1.2 -> 8.1.3

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Release Notes

angular/components

### [`v8.1.3`](https://togithub.com/angular/components/blob/master/CHANGELOG.md#​813-gelatin-key-2019-08-14) [Compare Source](https://togithub.com/angular/components/compare/8.1.2...8.1.3) ##### Bug Fixes - **cdk/virtual-scroll:** fix subpixel rounding errors on hdpi… ([#​16269](https://togithub.com/angular/components/issues/16269)) ([5bbf9ba](https://togithub.com/angular/components/commit/5bbf9ba)) - **cdk-experimental/popover-edit:** prevent default escape action ([#​16747](https://togithub.com/angular/components/issues/16747)) ([073b98c](https://togithub.com/angular/components/commit/073b98c)), closes [#​16202](https://togithub.com/angular/components/issues/16202) ##### Features - **cdk-experimental/clipboard:** add cdk-experimental clipboard service + directive ([#​16704](https://togithub.com/angular/components/issues/16704)) ([6c51995](https://togithub.com/angular/components/commit/6c51995))

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