DOTNET-6005 Add k8s 1.31 to test matrix #812

Job	Run time
generate-version	3s
build-manifests	4s
build-helm-chart	21s
build-image	1m 40s
test-manifests (manifests, 1.31)	10s
test-manifests (manifests, 1.30)	14s
test-manifests (manifests, 1.29)	10s
test-manifests (manifests, 1.28)	10s
test-manifests (manifests, 1.27)	9s
test-manifests (helm-manifests, 1.31)	16s
test-manifests (helm-manifests, 1.30)	16s
test-manifests (helm-manifests, 1.29)	10s
test-manifests (helm-manifests, 1.28)	10s
test-manifests (helm-manifests, 1.27)	11s
test-image	0s
release-internal	0s
release-public	0s
	4m 4s

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