Bug - NumberInput: values/validation status not announced to assistive tech on update

Describe the problem
Followup to #7806. Relevant comment chains: https://github.com/patternfly/patternfly-react/pull/7806#pullrequestreview-1077847330, https://github.com/patternfly/patternfly-react/pull/7806#pullrequestreview-1077854208, and https://github.com/patternfly/patternfly-react/pull/7806#issuecomment-1220611457

How do you reproduce the problem?

1. Go to Number input

2. Turn on VoiceOver or another screen reader

3. Use keyboard to update the input (either via the +/- buttons or within the input itself)

4. Notice the value does not get announced

   • In Chromium browsers, updating via buttons or via the input itself does not trigger an announcement. In Firefox and Safari, updating via the input announces the new value but updating via the buttons does not.

Expected behavior
The new value of the input and/or the validation status is announced to assistive tech

Is this issue blocking you?
N/A

Screenshots
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What is your environment?
N/A

What is your product and what release date are you targeting?
N/A

Any other information?
N/A

Jira Issue: PF-174

Inizia con il componente Number input all’indirizzo https://www.patternfly.org/v4/components/number-input ed esamina la discussione collegata in PR #7806 e i relativi commenti. Riproduci gli aggiornamenti con VoiceOver o un altro screen reader in Chromium, Firefox e Safari, quindi verifica che le modifiche al valore e/o alla convalida vengano annunciate sia per gli aggiornamenti tramite pulsanti sia per gli aggiornamenti tramite input diretto.