Remove Dependabot entries for retired branch 4.3.x #337

Job	Run time
deploy / setup	3s
deploy / Build main (JDK 21)	5m 34s
deploy / Build main (JDK 17)	7m 53s
deploy / Build main (JDK 25)	5m 45s
deploy / Trigger CI for non-default branches	0s
	19m 15s

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