Fix BeansXmlValidator#loadXsds to operate on StreamSource types #1436

Job	Run time
Initial JDK 17 Weld Build + WildFly patch	2m 53s
Weld In-container Tests - JDK 17	6m 46s
Relaxed mode testing - JDK 17	10m 13s
Weld In-container Tests - JDK 21	6m 47s
CDI TCK SE - JDK 17	48s
CDI TCK - JDK 17	6m 33s
CDI TCK SE - JDK 21	51s
Weld Examples build and test - JDK 17}	2m 3s
CDI TCK - JDK 21	6m 28s
Weld Tests w/o Container - JDK 17	3m 47s
Weld Tests w/o Container - JDK 21	3m 32s
Weld SE-Servlet Cooperation	51s
	51m 32s

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