Bump AWSSDK.Core from 3.7.303.18 to 3.7.303.26 (#630) #732

Job	Run time
YAML Tests (Unreleased OpenSearch) (1.x)	3m 34s
YAML Tests (Released OpenSearch) (2.11.1)	3m 39s
YAML Tests (Unreleased OpenSearch) (2.x)	5m 59s
YAML Tests (Released OpenSearch) (2.10.0)	3m 0s
YAML Tests (Unreleased OpenSearch) (main)	5m 58s
YAML Tests (Released OpenSearch) (2.8.0)	3m 11s
YAML Tests (Released OpenSearch) (2.6.0)	2m 58s
YAML Tests (Released OpenSearch) (2.4.1)	4m 1s
YAML Tests (Released OpenSearch) (2.2.1)	3m 6s
YAML Tests (Released OpenSearch) (2.0.1)	3m 23s
YAML Tests (Released OpenSearch) (1.3.14)	3m 23s
YAML Tests (Released OpenSearch) (1.2.4)	3m 3s
YAML Tests (Released OpenSearch) (1.1.0)	3m 3s
	48m 18s

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