Update maven-jar-plugin to 3.1.0 (aligns with JSP)

Signed-off-by: Mark Thomas <markt@apache.org>

api/pom.xml

diff --git a/api/pom.xml b/api/pom.xml
index 938feed..f52657e 100644
--- a/api/pom.xml
+++ b/api/pom.xml
@@ -190,7 +190,7 @@
             <!-- Adds the manifest file created by the org.apache.felix:maven-bundle-plugin -->
             <plugin>
                 <artifactId>maven-jar-plugin</artifactId>
-                <version>2.4</version>
+                <version>3.1.0</version>
                 <configuration>
                     <archive>
                         <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>

impl/pom.xml

diff --git a/impl/pom.xml b/impl/pom.xml
index 2d9f2d6..0cd0b8b 100644
--- a/impl/pom.xml
+++ b/impl/pom.xml
@@ -159,7 +159,7 @@
             
             <plugin>
                 <artifactId>maven-jar-plugin</artifactId>
-                <version>2.4</version>
+                <version>3.1.0</version>
                 <configuration>
                     <archive>
                         <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>

pom.xml

diff --git a/pom.xml b/pom.xml
index 6604343..9d3c3d0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -200,7 +200,7 @@
             <!-- Adds the manifest file created by the org.apache.felix:maven-bundle-plugin -->
             <plugin>
                 <artifactId>maven-jar-plugin</artifactId>
-                <version>2.4</version>
+                <version>3.1.0</version>
                 <configuration>
                     <archive>
                         <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>