Update archetype versioning after cutting 2.0.0-beta3 release branch

Signed-off-by: Jason Kuster <jasonkuster@google.com>

Author: jasonkuster

maven-archetypes/examples-java8/src/main/resources/archetype-resources/pom.xml

@@ -128,7 +128,7 @@
     <dependency>
       <groupId>com.google.cloud.dataflow</groupId>
       <artifactId>google-cloud-dataflow-java-sdk-all</artifactId>
-      <version>2.0.0-beta3-SNAPSHOT</version>
+      <version>2.0.0-beta4-SNAPSHOT</version>
     </dependency>
 
     <!-- Dependencies below this line are specific dependencies needed by the examples code. -->

maven-archetypes/examples/src/main/resources/archetype-resources/pom.xml

@@ -128,7 +128,7 @@
     <dependency>
       <groupId>com.google.cloud.dataflow</groupId>
       <artifactId>google-cloud-dataflow-java-sdk-all</artifactId>
-      <version>2.0.0-beta3-SNAPSHOT</version>
+      <version>2.0.0-beta4-SNAPSHOT</version>
     </dependency>
 
     <!-- Dependencies below this line are specific dependencies needed by the examples code. -->

maven-archetypes/starter/src/main/resources/archetype-resources/pom.xml

@@ -72,7 +72,7 @@
     <dependency>
       <groupId>com.google.cloud.dataflow</groupId>
       <artifactId>google-cloud-dataflow-java-sdk-all</artifactId>
-      <version>2.0.0-beta3-SNAPSHOT</version>
+      <version>2.0.0-beta4-SNAPSHOT</version>
     </dependency>
 
     <!-- slf4j API frontend binding with JUL backend -->

maven-archetypes/starter/src/test/resources/projects/basic/reference/pom.xml

@@ -72,7 +72,7 @@
     <dependency>
       <groupId>com.google.cloud.dataflow</groupId>
       <artifactId>google-cloud-dataflow-java-sdk-all</artifactId>
-      <version>2.0.0-beta3-SNAPSHOT</version>
+      <version>2.0.0-beta4-SNAPSHOT</version>
     </dependency>
 
     <!-- slf4j API frontend binding with JUL backend -->