engines/io_uring_cmd: allocate enough ranges for async trims #449

Job	Run time
build (linux-gcc)	9m 44s
build (linux-clang)	9m 26s
build (macos)	8m 35s
build (linux-i686-gcc)	8m 41s
build (android)	47s
build (windows-cygwin-64)	11m 18s
build (windows-cygwin-32)	11m 8s
build (windows-msys2-64)	10m 25s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	46s
	1h 10m 50s

Provide feedback