wifi: rtw89: coex: Update Wi-Fi/Bluetooth coexistence version to 9.0.0

The version 9 support the WiFi7 related functions.

Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250616090252.51098-12-pkshih@realtek.com