v7.21.0 release (#23330) #340

Job	Run time
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/FormModels)	1m 14s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/AllOf)	1m 26s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/OneOf)	1m 8s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/AnyOf)	1m 17s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/AnyOfNoCompare)	1m 11s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/UseDateTimeForDate)	1m 4s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/AnyOfNoCompare)	1m 14s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/UseDateTimeForDate)	1m 37s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/AnyOf)	1m 30s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/AllOf)	1m 17s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/OneOf)	1m 31s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/FormModels)	1m 14s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/Petstore)	1m 39s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/Petstore)	1m 32s
	18m 54s

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