[java] Update dependency org.mockito:mockito-core to v5.15.2 #108

Job	Run time
pin	1m 12s
CI - GitHub / Check	2m 55s
Check format / Check format script run	8m 41s
Test / All RBE tests	13m 16s
CI - GitHub / .NET	0s
CI - GitHub / Ruby	0s
CI - GitHub / Python	0s
CI - GitHub / Rust	0s
CI - GitHub / Java / Browser Tests (windows) / Browser Tests (chrome, windows)	5m 31s
CI - GitHub / Java / Browser Tests (macos) / Browser Tests (chrome, macos)	3m 3s
CI - GitHub / Java / Remote Tests (macos) / Remote Tests (chrome, macos)	3m 2s
	37m 40s

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