Enable strict mode 6.9 in qtspeech


Task-number: QTBUG-145302
Pick-to: 6.11 6.10
Change-Id: Ie723b02acbb0b320abbcea52bb08392093a02b88
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
commit84ef452a0176bf249ce640466532dc69e61177d0
parent9d3b4f80d81205fbe32b6b5a14dd63446bfa7516
authorMarc Mutz <marc.mutz@qt.io>
committerMarc Mutz <marc.mutz@qt.io>
commit timeFri, 27 Mar 2026 18:24:29 +0100