Bump FluentAssertions from 6.12.0 to 6.12.1 #2268

Job	Run time
Integration OpenSearch Unreleased (1.x, 11)	4m 16s
Integration OpenSearch (2.16.0)	7m 3s
Integration OpenSearch Unreleased (2.x, 17)	5m 36s
Integration OpenSearch (2.14.0)	7m 17s
Integration OpenSearch Unreleased (main, 21)	5m 43s
Integration OpenSearch (2.12.0)	6m 50s
Integration OpenSearch (2.10.0)	6m 26s
Integration OpenSearch (2.8.0)	6m 53s
Integration OpenSearch (2.6.0)	5m 43s
Integration OpenSearch (2.4.1)	4m 40s
Integration OpenSearch (2.2.1)	4m 35s
Integration OpenSearch (2.0.1)	4m 34s
Integration OpenSearch (1.3.14)	5m 20s
Integration OpenSearch (1.2.4)	4m 32s
Integration OpenSearch (1.1.0)	4m 29s
	1h 23m 57s

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