Angular Material Radio button - Ripple effect persists until clicking away.

### Which @angular/* package(s) are the source of the bug?

Don't known / other

### Is this a regression?

Yes

### Description

Clicking on a radio button now persists the ripple effect. This issue seems to have appeared since Angular 11 and still exists in Angular 12. This bug can be seen in angular material documentation.

Angular 10. No persistent ripple.
https://v10.material.angular.io/components/radio/overview

Angular 11. Persistent ripple issue which clears after clicking somewhere on the screen
https://v11.material.angular.io/components/radio/overview

Although not perfect I've added the following css to hide the bug as a workaround.

`
.mat-radio-button:not(.mat-radio-disabled).cdk-program-focused .mat-radio-persistent-ripple {
opacity: 0;
}
`

I couldn't find a ticket regarding this issue so thought it's worth raising one.

### Please provide a link to a minimal reproduction of the bug

https://v11.material.angular.io/components/radio/overview

### Please provide the exception or error you saw

_No response_

### Please provide the environment you discovered this bug in

_No response_

### Anything else?

_No response_

Beginne mit den im Issue verlinkten Angular Material-Radio-Beispielen und vergleiche das Verhalten von Angular 10 und Angular 11, um die Regression einzugrenzen. Reproduziere den dauerhaft sichtbaren Ripple nach der Auswahl eines Radio-Buttons und überprüfe anschließend, dass er verschwindet, ohne dass ein Klick an einer anderen Stelle erforderlich ist, einschließlich im Dokumentationsbeispiel.

Vom Indexierungsmodell aus dem Issue-Text verfasst.