Disable automatic rebases on dependabot #5841

Job	Run time
build with jdk 25	8m 57s
Quarkus tests (25)	42m 26s
WildFly GraphQL feature pack tests (17)	23m 1s
build with jdk 21	8m 44s
Quarkus tests (17)	45m 25s
build with jdk 17	9m 13s
quality	0s
	2h 17m 46s

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