Bump System.Buffers from 4.5.1 to 4.6.0 #2450

Job	Run time
Integration OpenSearch Unreleased (1.x, 11)	4m 32s
Integration OpenSearch (2.16.0)	7m 16s
Integration OpenSearch Unreleased (2.x, 17)	10m 31s
Integration OpenSearch (2.14.0)	6m 55s
Integration OpenSearch Unreleased (main, 21)	11m 27s
Integration OpenSearch (2.12.0)	7m 2s
Integration OpenSearch (2.10.0)	6m 50s
Integration OpenSearch (2.8.0)	6m 34s
Integration OpenSearch (2.6.0)	5m 59s
Integration OpenSearch (2.4.1)	4m 59s
Integration OpenSearch (2.2.1)	4m 50s
Integration OpenSearch (2.0.1)	5m 0s
Integration OpenSearch (1.3.14)	5m 19s
Integration OpenSearch (1.2.4)	4m 57s
Integration OpenSearch (1.1.0)	4m 41s
	1h 36m 52s

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