Consume core Penta updates: Slider

[tlabaj]

Follow up top core PR patternfly/patternfly#6157

[thatblindgeye]

Shouldn't require any updates in React for Slider. There are some things related to the input groups used for examples with a value input, but those issues should be resolved by the Core issue for input group. React components use the __value--c-form-control--width-chars, __value, and __step--Left CSS vars, all of which are still intact in Core.

Some screenshots below of alpha 51 locally compare to the Core v6 staging cc @mcoker @andrew-ronaldson

Following is a slider with RTL enabled to show styling works correctly

[srambach]

Looks good - input group should fix the inputs that don't look quite right. 🎚️

[thatblindgeye]

Closing per comments above + agreement from @andrew-ronaldson