Bump rexml from 3.3.6 to 3.3.9 #2324

Job	Run time
integration-tests (ubuntu-latest, dash, 4)	1m 24s
lint	25s
coverage	4m 16s
unit-tests (ubuntu-latest, dash, 4)	2m 10s
unit-tests (windows-latest, bash, 1)	10m 36s
unit-tests (windows-latest, cygwin, 1)	7m 25s
unit-tests (windows-latest, wsl, 4)	8m 5s
unit-tests (macos-latest, bash 3.2, 4)	2m 44s
unit-tests (macos-latest, bash 3.2 with coreutils, 4)	3m 16s
unit-tests (ubuntu-latest, registry.access.redhat.com/ubi8/ubi-minimal, bash 4.4, 4)	2m 16s
unit-tests (ubuntu-latest, alpine, zsh, 4)	2m 6s
unit-tests (ubuntu-latest, alpine, ash, 4)	2m 17s
unit-tests (ubuntu-latest, ubuntu:22.04, posh, 4)	2m 35s
report	8s
	49m 43s

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