Bump rdoc from 6.5.0 to 6.5.1.1 in /test/truffle/gems/default-bundled-gems #1663

Job	Run time
build jvm	6m 42s
build native	14m 54s
lint	14m 34s
ruby/spec on CRuby 3.0	3m 32s
ruby/spec on CRuby 3.1	3m 25s
ruby/spec on CRuby 3.2	3m 0s
specs :truffle	9m 16s
specs :language :core	11m 41s
specs :library :cext :security :command_line :tracepoint	9m 7s
fast specs	3m 47s
test integration	10m 4s
run MRI tests on native	14m 23s
test native	2m 47s
	1h 47m 12s

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