nz-slider nzDots/nzStep Function failure

[ccScavengers]

Reproduction link

https://stackblitz.com/edit/ng-zorro-antd-ivy-mcwbqg?file=src/app/app.component.ts

Steps to reproduce

The first is the example of setting step and the other is setting nzdots. Drag to find that the node cannot be selected

What is expected?

[nzStep]="null"/[nzDots]="true" can work ,In the examples,I can choose nodes.

What is actually happening?

Both nzstep and nzdots do not work, and the component uses the default parameter of 1

Environment	Info
ng-zorro-antd	9.2.2
Browser	chorme

[wzhudev]

The Slider component doesn't support decimals with nzStep currently. I will fix this.