Bump rexml from 3.3.6 to 3.3.9 (#486) #2325

Job	Run time
coverage	4m 26s
lint	25s
integration-tests (ubuntu-latest, dash, 4)	1m 25s
unit-tests (ubuntu-latest, dash, 4)	2m 3s
unit-tests (windows-latest, bash, 1)	9m 52s
unit-tests (windows-latest, cygwin, 1)	6m 45s
unit-tests (windows-latest, wsl, 4)	7m 27s
unit-tests (macos-latest, bash 3.2, 4)	2m 43s
unit-tests (macos-latest, bash 3.2 with coreutils, 4)	2m 41s
unit-tests (ubuntu-latest, registry.access.redhat.com/ubi8/ubi-minimal, bash 4.4, 4)	2m 15s
unit-tests (ubuntu-latest, alpine, zsh, 4)	2m 14s
unit-tests (ubuntu-latest, alpine, ash, 4)	2m 11s
unit-tests (ubuntu-latest, ubuntu:22.04, posh, 4)	2m 30s
report	3s
	47m 0s

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