fix initialize IT by using old rake version

Author: mkristian

gem-maven-plugin/src/it/initialize/pom.xml

@@ -17,6 +17,12 @@
       <version>2.3.5</version>
       <type>gem</type>
     </dependency>
+    <dependency>
+      <groupId>rubygems</groupId>
+      <artifactId>rake</artifactId>
+      <version>10.0.0</version>
+      <type>gem</type>
+    </dependency>
     <dependency>
       <groupId>rubygems</groupId>
       <artifactId>rack</artifactId>