Bump rexml from 3.2.8 to 3.3.6 #1

Job	Run time
catalyst	8m 14s
integration	18m 49s
pod-lib-lint (ios, macos-14)	4m 34s
quickstart	1m 38s
spm (iOS, macos-13)	49s
pod-lib-lint (ios, macos-13)	12m 7s
spm (iOS, macos-14)	37s
pod-lib-lint (tvos, macos-14)	4m 5s
spm (tvOS, macos-13)	40s
pod-lib-lint (tvos, macos-13)	8m 53s
pod-lib-lint (macos --skip-tests, macos-14)	5m 39s
pod-lib-lint (macos --skip-tests, macos-13)	6m 36s
pod-lib-lint (watchos, macos-14)	4m 13s
pod-lib-lint (watchos, macos-13)	5m 51s
spm (tvOS, macos-14)	34s
spm (macOS, macos-13)	43s
spm (macOS, macos-14)	36s
spm (catalyst, macos-13)	55s
spm (catalyst, macos-14)	37s
spm (watchOS, macos-13)	1s
spm (watchOS, macos-14)	1s
spm (macos-14, visionOS, Xcode_15.3)	30s
database-cron-only	0s
	1h 26m 42s

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