chore(deps): update dependency com.sendgrid:sendgrid-java to v4.6.4 (GoogleCloudPlatform#3576)

Author: renovate-bot

appengine-java8/sendgrid/pom.xml

@@ -48,7 +48,7 @@ Copyright 2018 Google LLC
     <dependency>
       <groupId>com.sendgrid</groupId>
       <artifactId>sendgrid-java</artifactId>
-      <version>4.6.3</version>
+      <version>4.6.4</version>
     </dependency>
     <!-- [END gae_sendgrid_dependencies] -->
   </dependencies>

compute/sendgrid/pom.xml

@@ -40,7 +40,7 @@
     <dependency>
       <groupId>com.sendgrid</groupId>
       <artifactId>sendgrid-java</artifactId>
-      <version>4.6.3</version>
+      <version>4.6.4</version>
     </dependency>
     <!-- [END dependencies] -->
   </dependencies>

flexible/sendgrid/pom.xml

@@ -52,7 +52,7 @@
     <dependency>
       <groupId>com.sendgrid</groupId>
       <artifactId>sendgrid-java</artifactId>
-      <version>4.6.3</version>
+      <version>4.6.4</version>
     </dependency>
     <!-- [END gae_flex_sendgrid_dependencies] -->
   </dependencies>