Update to latest gpg plugin.

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@604225 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/scrplugin/pom.xml b/scrplugin/pom.xml
index 1fae616..91afd6f 100644
--- a/scrplugin/pom.xml
+++ b/scrplugin/pom.xml
@@ -96,7 +96,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-gpg-plugin</artifactId>
-                    <version>1.0-alpha-3</version>
+                    <version>1.0-alpha-4</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>