Updated to CredScan 3 (#2768)

.vsts/win/credscan.yml

@@ -1,9 +1,8 @@
 steps:
   # Static analysis before build
-  - task: securedevelopmentteam.vss-secure-development-tools.build-task-credscan.CredScan@2
+  - task: securedevelopmentteam.vss-secure-development-tools.build-task-credscan.CredScan@3
     displayName: "Run CredScan"
     inputs:
       suppressionsFile: .vsts/cred-scan-exclude.json
-      toolMajorVersion: V2
       debugMode: false