Bump xunit from 2.6.5 to 2.6.6 #430

Job	Run time
YAML Tests (Released OpenSearch) (2.11.1)	3m 22s
YAML Tests (Released OpenSearch) (2.11.1)	3m 22s
YAML Tests (Released OpenSearch) (2.10.0)	3m 35s
YAML Tests (Released OpenSearch) (2.10.0)	3m 35s
YAML Tests (Unreleased OpenSearch) (1.x)	3m 26s
YAML Tests (Unreleased OpenSearch) (1.x)	3m 26s
YAML Tests (Released OpenSearch) (2.8.0)	3m 15s
YAML Tests (Released OpenSearch) (2.8.0)	3m 15s
YAML Tests (Unreleased OpenSearch) (2.x)	42s
YAML Tests (Unreleased OpenSearch) (2.x)	4m 4s
YAML Tests (Unreleased OpenSearch) (main)	4m 16s
YAML Tests (Unreleased OpenSearch) (main)	4m 16s
YAML Tests (Released OpenSearch) (2.6.0)	3m 11s
YAML Tests (Released OpenSearch) (2.6.0)	3m 11s
YAML Tests (Released OpenSearch) (2.4.1)	3m 27s
YAML Tests (Released OpenSearch) (2.4.1)	3m 27s
YAML Tests (Released OpenSearch) (2.2.1)	3m 21s
YAML Tests (Released OpenSearch) (2.2.1)	3m 21s
YAML Tests (Released OpenSearch) (2.0.1)	3m 31s
YAML Tests (Released OpenSearch) (2.0.1)	3m 31s
YAML Tests (Released OpenSearch) (1.3.14)	3m 32s
YAML Tests (Released OpenSearch) (1.3.14)	3m 32s
YAML Tests (Released OpenSearch) (1.2.4)	3m 26s
YAML Tests (Released OpenSearch) (1.2.4)	3m 26s
YAML Tests (Released OpenSearch) (1.1.0)	2m 40s
YAML Tests (Released OpenSearch) (1.1.0)	2m 40s
	1h 26m 50s

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