Tweak OAEP's `MAX_LABEL_LEN` constant (#437) #718

Job	Run time
minimal-versions	45s
doc	51s
nightly	1m 14s
build (1.72.0, thumbv7em-none-eabi)	26s
build (1.72.0, wasm32-unknown-unknown)	23s
test (1.72.0)	7m 35s
build (stable, thumbv7em-none-eabi)	16s
test (stable)	7m 1s
build (stable, wasm32-unknown-unknown)	22s
	18m 53s

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