Bump jetty.version from 12.0.14 to 12.0.15 #1515

Job	Run time
Initial JDK 17 Weld Build + WildFly patch	2m 49s
CDI TCK - JDK 17	11m 0s
CDI TCK - JDK 21	10m 24s
CDI TCK SE - JDK 17	48s
CDI TCK SE - JDK 21	1m 0s
Weld In-container Tests - JDK 17	6m 39s
Weld Examples build and test - JDK 17}	1m 10s
Weld In-container Tests - JDK 21	6m 24s
Weld Tests w/o Container - JDK 17	3m 40s
Weld Tests w/o Container - JDK 21	3m 28s
Relaxed mode testing - JDK 17	13m 51s
Weld SE-Servlet Cooperation	27s
	1h 1m 40s

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