Bump org.assertj:assertj-core from 3.25.3 to 3.26.0 in /java-connectors #271

Job	Run time
initiate-java-modules	29s
test (kafka-connect-azure-eventhubs)	45s
test (kafka-connect-common)	54s
test (kafka-connect-gcp-common)	54s
test (kafka-connect-gcp-pubsub)	1m 0s
test (kafka-connect-query-language)	46s
build-and-cache (kafka-connect-azure-eventhubs)	55s
build-and-cache (kafka-connect-gcp-common)	59s
build-and-cache (kafka-connect-gcp-pubsub)	1m 8s
jar-dependency-check (kafka-connect-azure-eventhubs)	29s
jar-dependency-check (kafka-connect-gcp-common)	29s
jar-dependency-check (kafka-connect-gcp-pubsub)	30s
	9m 18s

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