Bump rexml from 3.3.4 to 3.3.6 #2986

Job	Run time
spm-integration (macos-14)	24m 4s
pod-lib-lint (ios, macos-14)	2m 2s
spm-unit (iOS, macos-13)	7m 7s
pod-lib-lint (ios, macos-13)	2m 49s
spm-unit (iOS, macos-14)	6m 45s
pod-lib-lint (tvos, macos-14)	2m 26s
spm-unit (tvOS, macos-13)	4m 35s
pod-lib-lint (tvos, macos-13)	4m 3s
spm-unit (tvOS, macos-14)	2m 45s
pod-lib-lint (macos, macos-14)	2m 26s
spm-unit (macOS, macos-13)	4m 0s
pod-lib-lint (macos, macos-13)	5m 22s
spm-unit (macOS, macos-14)	3m 58s
pod-lib-lint (watchos, macos-14)	1m 55s
spm-unit (catalyst, macos-13)	3m 11s
pod-lib-lint (watchos, macos-13)	2m 29s
spm-unit (catalyst, macos-14)	4m 31s
spm-unit (watchOS, macos-13)	5m 59s
spm-unit (watchOS, macos-14)	5m 3s
spm-unit (macos-14, visionOS, Xcode_15.3)	5m 25s
functions-cron-only	0s
	1h 40m 55s

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