chore(deps): update patternfly deps to v6 alphas

[evwilkin]

Bumps versions:

"@patternfly/react-core": "6.0.0-alpha.19",
"@patternfly/react-icons": "6.0.0-alpha.9",
"@patternfly/react-styles": "6.0.0-alpha.9"

Fixes type errors thrown in Nav && EmptyState components due to changes in these components in newer versions.

[evwilkin]

@tlabaj I need to update snapshots with the new alpha version bump for Nav no longer having the theme prop as well as the pf-m-expandable class being removed as seen in your PR.

In checking before updating the snapshot, the theme prop is straightforward but I'm having trouble confirming that the pf-m-expandable is something that should be removed, as it looks to still be on the Core markup. Do you mind taking a look to confirm that this class should be dropped?

[tlabaj]

@tlabaj I need to update snapshots with the new alpha version bump for Nav no longer having the theme prop as well as the pf-m-expandable class being removed as seen in your PR.

In checking before updating the snapshot, the theme prop is straightforward but I'm having trouble confirming that the pf-m-expandable is something that should be removed, as it looks to still be on the Core markup. Do you mind taking a look to confirm that this class should be dropped?

I believe core examples need to be updated. The pf-m-expandable modifier no longer exists in the style sheet so I talked to @mattnolting and removed it in React.

[tlabaj]

@evwilkin @mattnolting I opened this core issue patternfly/patternfly#6248