Add support for `PATCH` in `HttpConnection.ConvertHttpMethod` (#489) … #1350

Job	Run time
Integration OpenSearch Unreleased	0s
Integration OpenSearch (2.9.0)	8m 17s
Integration OpenSearch (2.8.0)	6m 10s
Integration OpenSearch (2.7.0)	6m 24s
Integration OpenSearch (2.6.0)	6m 22s
Integration OpenSearch (2.5.0)	6m 43s
Integration OpenSearch (2.4.1)	6m 24s
Integration OpenSearch (2.3.0)	6m 7s
Integration OpenSearch (2.2.1)	6m 7s
Integration OpenSearch (2.1.0)	6m 14s
Integration OpenSearch (2.0.1)	6m 23s
Integration OpenSearch (1.3.11)	6m 31s
Integration OpenSearch (1.2.4)	6m 12s
Integration OpenSearch (1.1.0)	6m 4s
	1h 23m 58s

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