tests: Update the golden files' copyright to 2025 #9729

Job	Run time
build(21) except self-service clients	13m 25s
build (11)	14m 40s
build(8) except for gapic-generator-java	4m 12s
build (17)	15m 5s
build(8) for gapic-generator-java	11m 12s
compatibility	1m 51s
lint	26s
showcase (11)	4m 23s
showcase (17)	4m 9s
showcase (21)	4m 27s
dependency_analyzer_unit_test	20s
gapic-generator-java-bom	1m 56s
showcase-clirr	3m 6s
showcase-native	8m 38s
unmanaged_dependency_check	4m 54s
	1h 32m 44s

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