AP_GPS: UBLOX: fix memory leak when "F9" GNSS configuration is used #46634

Job	Run time
build (stm32f7, chibios, 10)	4m 1s
build (stm32h7, chibios, 10)	3m 35s
build (fmuv2-plane, chibios, 10)	1m 45s
build (periph-build, chibios, 10)	4m 3s
build (iofirmware, chibios, 10)	1m 37s
build (CubeOrange-bootloader, chibios, 10)	49s
build (fmuv3-bootloader, chibios, 10)	52s
build (revo-bootloader, chibios, 10)	1m 11s
build (stm32h7-debug, chibios, 10)	2m 15s
build (fmuv3, chibios, 10)	6m 10s
build (revo-mini, chibios, 10)	4m 15s
build (MatekF405-Wing, chibios, 10)	4m 49s
build (CubeOrange-ODID, chibios, 10)	2m 40s
build (CubeRedPrimary-bootloader, chibios, 10)	51s
build (configure-all, chibios, 10)	11m 23s
build (build-options-defaults-test, chibios, 10)	7m 18s
build (signing, chibios, 10)	2m 41s
build (CubeOrange-PPP, chibios, 10)	1m 58s
build (CubeRed-EKF2, chibios, 10)	2m 4s
build (SOHW, chibios, 10)	3m 38s
build (Pixhawk6X-PPPGW, chibios, 10)	1m 17s
build (new-check, chibios, 10)	4m 11s
	1h 13m 23s

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