Improve RSS measurement #1922

Job	Run time
benchmark-default (ruby)	10m 46s
benchmark-graph	44s
test (truffleruby)	1m 39s
benchmark-default (head)	12m 45s
test (head)	46s
benchmark-ractor-only (head)	34s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 9s
benchmark-run-once	1m 48s
test (ruby)	47s
benchmark-ractor (head)	6m 56s
all-tests	3s
	49m 57s

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