Bump rexml from 3.2.8 to 3.3.3 in /site #38

Job	Run time
Linux (JDK 11), Oldest Guava, Pacific/Chatham Timezone	1m 32s
Linux (JDK 8)	1m 24s
Linux (JDK 8), Avatica main	1m 36s
Windows (JDK 11)	2m 2s
Linux (JDK 11), Middle-Aged Guava	1m 29s
Linux (JDK 11), Calcite Minimum Guava, America/New_York Timezone	1m 31s
Linux (JDK 11), Newest Guava	1m 27s
Linux (JDK 17)	1m 22s
Linux (JDK 21)	1m 26s
Linux (JDK 22)	1m 28s
macOS (JDK 21)	1m 43s
	17m 0s

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