engines/io_uring_cmd: allocate enough ranges for async trims #702

Job	Run time
build (linux-gcc)	11m 27s
build (linux-clang)	10m 37s
build (macos)	9m 49s
build (linux-i686-gcc)	9m 26s
build (android)	48s
build (windows-cygwin-64)	12m 47s
build (windows-cygwin-32)	10m 21s
build (windows-msys2-64)	12m 21s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	53s
	1h 18m 29s

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