Revert AutoREST.PowerShell to v3.0.509. (#2314)

Author: peombwa

config/ModuleMetadata.json

@@ -27,15 +27,15 @@
   "versions": {
     "authentication": {
       "prerelease": "",
-      "version": "2.6.0"
+      "version": "2.6.1"
     },
     "beta": {
       "prerelease": "",
-      "version": "2.6.0"
+      "version": "2.6.1"
     },
     "v1.0": {
       "prerelease": "",
-      "version": "2.6.0"
+      "version": "2.6.1"
     }
   }
 }

src/readme.graph.md

@@ -6,7 +6,7 @@
 azure: false
 powershell: true
 version: latest
-use: "@autorest/powershell@3.x"
+use: "@autorest/powershell@3.0.509"
 export-properties-for-dict: false
 metadata:
     authors: Microsoft Corporation