Bump AsyncGenerator to 0.18.3 for 5.3 branch with fix for .net 6

Author: bahusoid

Tools/packages.csproj

@@ -11,7 +11,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="CSharpAsyncGenerator.CommandLine" Version="0.18.2" />
+    <PackageReference Include="CSharpAsyncGenerator.CommandLine" Version="0.18.3" />
     <PackageReference Include="vswhere" Version="2.1.4" />
     <PackageReference Include="NUnit.Console" Version="3.10.0" />
     <PackageReference Include="GitReleaseManager" Version="0.11.0" />

global.json

@@ -0,0 +1,6 @@
+{
+  "sdk": {
+    "version": "2.1.0",
+    "rollForward": "latestMinor"
+  }
+}