test

Bump Microsoft.CodeAnalysis.CSharp from 5.0.0 to 5.3.0 #5116

Job	Run time
test	1m 38s
package	1m 10s
integration-test-net-framework	49s
validate-package	1m 43s
sample	46s
integration-test (10.0)	43s
integration-test (8.0)	37s
integration-test (9.0)	53s
	8m 19s

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