Lower the binary size gate's threshold #2193

Job	Run time
build artifacts [x64-linux]	6m 3s
build openhcl [aarch64-linux]	5m 25s
build mdbook guide	1m 33s
build and check docs [x64-windows]	9m 59s
verify openhcl binary size [x64]	6m 28s
build openhcl [x64-linux]	7m 52s
clippy [windows], unit tests [x64-windows]	12m 48s
clippy [linux, macos], unit tests [x64-linux]	8m 6s
unit tests [aarch64-windows]	7m 57s
clippy [linux-musl, misc nostd], unit tests [x64-linux-musl]	7m 17s
build and check docs [x64-linux]	2m 44s
test flowey local backend	3m 18s
xtask fmt (linux)	2m 25s
build artifacts (not for VMM tests) [aarch64-windows]	5m 50s
build artifacts (for VMM tests) [aarch64-windows]	10m 37s
build artifacts (not for VMM tests) [x64-windows]	4m 58s
build artifacts (for VMM tests) [x64-windows]	10m 21s
build artifacts [aarch64-linux]	5m 18s
xtask fmt (windows)	5m 58s
run vmm-tests [x64-windows-amd]	12m 14s
run vmm-tests [x64-windows-intel]	10m 46s
run vmm-tests [x64-linux]	3m 32s
run vmm-tests [aarch64-windows]	6m 10s
openvmm checkin gates	5s
	2h 37m 44s

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