Update version: 1.63.0 -> 1.64.0 (#2606)

Fixes:

- Discovery date/time types handling: #2575 and #2580

CSharpGeneratorFunctions.sh

@@ -1,7 +1,7 @@
 # This is intended to be imported using the "source" function
 # from any script that wants to invoke the C#-based generator.
 
-declare -r GAPIC_GENERATOR_VERSION=1.4.21
+declare -r GAPIC_GENERATOR_VERSION=1.4.22
 
 TMP_CSHARP_GENERATOR_DIR=tmp-gapic-generator-csharp
 if [[ $CSHARP_GENERATOR_DIR == "" ]]

Src/Support/CommonProjectProperties.xml

@@ -2,7 +2,7 @@
 
   <!-- common nupkg information -->
   <PropertyGroup>
-    <Version>1.64.0-alpha01</Version>
+    <Version>1.64.0</Version>
     <Authors>Google LLC</Authors>
     <Copyright>Copyright 2021 Google LLC</Copyright>
     <PackageTags>Google</PackageTags>

features.json

@@ -1,8 +1,8 @@
 {	
   "language": "csharp",	
   "description": "C# libraries for Google APIs.",	
-  "releaseVersion": "1.63.0", "comment1": "Version of generated package.",	
-  "currentSupportVersion": "1.63.0", "comment2": "Version of support library upon which to depend.",	
+  "releaseVersion": "1.64.0", "comment1": "Version of generated package.",	
+  "currentSupportVersion": "1.64.0", "comment2": "Version of support library upon which to depend.",	
 
   "clouds_comment": "Defines the map of Google.Cloud packages that supercede Google.Apis packages",	
   "cloudPackageMap": {