Run Ruby examples

Bump rexml from 3.4.1 to 3.4.2 in /examples/ruby #1965

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Run time

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Job	Run time
tests (windows, stable)	8m 30s
tests (macos, stable)	10m 38s
tests (windows, nightly)	10m 50s
lint	38s
tests (ubuntu, stable)	6m 50s
tests (ubuntu, nightly)	6m 25s
tests (macos, nightly)	7m 5s
	50m 56s