deps: update arrow.version to v18.2.0 #10333

Job	Run time
build (11)	15m 7s
build(8) except for gapic-generator-java	4m 13s
build (17)	15m 0s
build(21) except self-service clients	13m 32s
build(8) for gapic-generator-java	11m 37s
compatibility	1m 58s
lint	50s
showcase (11)	5m 31s
showcase (17)	5m 43s
showcase (21)	5m 57s
showcase (23)	5m 46s
dependency_analyzer_unit_test	13s
gapic-generator-java-bom	1m 54s
showcase-clirr	3m 22s
unmanaged_dependency_check	8m 0s
	1h 38m 43s

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