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Bump prism to 1.9.0 in the rubocop benchmark to fix CI #2189

Job	Run time
benchmark-run-once	1m 27s
test (head)	1m 12s
test-windows (ruby)	1m 46s
benchmark-default-windows (ruby)	20m 51s
benchmark-default (ruby)	7m 58s
test (ruby)	49s
benchmark-ractor (head)	19m 53s
test (truffleruby)	1m 32s
benchmark-graph	8m 24s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	11m 58s
benchmark-default-windows (head)	37m 57s
benchmark-default (head)	10m 19s
benchmark-ractor-only (head)	2m 27s
test-windows (head)	1m 23s
all-tests	4s
	2h 8m 0s