chore: Update rbs gem to version 3.5.3 #1382

Job	Run time
check-misc (head)	10s
test-memory (head)	38s
test-ruby (head, master)	6m 25s
steep-check (head)	21s
test-ruby (3.0, master)	6m 10s
test-windows (head)	1m 56s
ruby-versions / Generate Ruby versions	2s
test-cpp (head, g++)	12s
test-cpp (head, clang++)	13s
test (2.5)	30s
test (2.6)	33s
test (2.7)	28s
test (3.0)	15s
test (3.1)	17s
test (3.2)	14s
test (3.3)	13s
test (head)	12s
	18m 49s

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