Updated pom file: newer versions of tycho and jarsigner

.mvn/extensions.xml

diff --git a/.mvn/extensions.xml b/.mvn/extensions.xml
index cbfcda0..62eaab5 100644
--- a/.mvn/extensions.xml
+++ b/.mvn/extensions.xml
@@ -3,6 +3,6 @@
   <extension>

     <groupId>org.eclipse.tycho</groupId>

     <artifactId>tycho-build</artifactId>

-    <version>3.0.3</version>

+    <version>3.0.4</version>

   </extension>

 </extensions>
\ No newline at end of file

pom.xml

diff --git a/pom.xml b/pom.xml
index f593563..73165ed 100644
--- a/pom.xml
+++ b/pom.xml
@@ -48,11 +48,11 @@
 		<app4mc.baseline>3.0.0</app4mc.baseline>
 
 		<!-- must be same version as in ./.mvn/extensions.xml -->
-		<tycho.version>3.0.3</tycho.version>
+		<tycho.version>3.0.4</tycho.version>
 
 		<java.version>11</java.version>
 
-		<jarsigner-version>1.3.1</jarsigner-version>
+		<jarsigner-version>1.4.2</jarsigner-version>
 
 		<build-helper.version>1.9.1</build-helper.version>