Table caption is not announced by some screen readers

[lkszzajac]

📝 Provide detailed reproduction steps (if any)

1. Go to documentation demo for table captions https://ckeditor.com/docs/ckeditor5/latest/features/tables/tables-caption.html
2. Focus the table and wait for screen reader announcement
3. Enter the table via keyboard (Enter key) and wait for screen reader announcement

✔️ Expected result

• table caption and dimensions are announced by the screen reader

❌ Actual result

• none of tested screen readers (VoiceOver, NVDA, JAWS) are announcing the table caption when focusing entire widget
• only NVDA is reading table dimensions and caption upon entry

📃 Other details

• Browser: Chrome
• OS: macOS/Windows
• First affected CKEditor version: n/a
• Installed CKEditor plugins: n/a
• Related issue: Table caption is not accessible via keyboard navigation #16438

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