Bump rexml from 3.3.4 to 3.3.6 #2558

Job	Run time
catalyst	4m 44s
pod-lib-lint (ios, macos-14)	7m 19s
pod-lib-lint (ios, macos-13)	2m 46s
quickstart	15m 22s
pod-lib-lint (tvos, macos-14)	5m 44s
pod-lib-lint (tvos, macos-13)	3m 19s
pod-lib-lint (macos --skip-tests, macos-14)	2m 8s
spm (iOS, macos-13)	4m 10s
spm (iOS, macos-14)	2m 37s
pod-lib-lint (macos --skip-tests, macos-13)	4m 3s
pod-lib-lint (watchos, macos-14)	2m 54s
spm (tvOS, macos-13)	4m 12s
quickstart-ftl-cron-only	0s
pod-lib-lint (watchos, macos-13)	3m 28s
spm (tvOS, macos-14)	2m 18s
spm (macOS, macos-13)	3m 5s
spm (macOS, macos-14)	2m 35s
spm (watchOS, macos-13)	3m 51s
spm (watchOS, macos-14)	5m 18s
spm (catalyst, macos-13)	2m 25s
spm (catalyst, macos-14)	2m 32s
spm (macos-14, visionOS, Xcode_15.3)	1m 55s
installations-cron-only	0s
	1h 26m 45s

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