[releng] Upgrade to the latest versions of maven plugins
diff --git a/releng/pom.xml b/releng/pom.xml
index 05b9eff..9ad0a7d 100644
--- a/releng/pom.xml
+++ b/releng/pom.xml
@@ -20,11 +20,11 @@
   <version>1.3.0-SNAPSHOT</version>
   <packaging>pom</packaging>
   <prerequisites>
-    <maven>3.0</maven>
+    <maven>3.5.0</maven>
   </prerequisites>
   <properties>
-    <tycho.version>1.3.0</tycho.version>
-    <tycho.extras.version>1.3.0</tycho.extras.version>
+    <tycho.version>1.6.0</tycho.version>
+    <tycho.extras.version>1.6.0</tycho.extras.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <maven.build.timestamp.format>yyyyMMdd-HHmm</maven.build.timestamp.format>
@@ -150,6 +150,11 @@
         </plugin>
         <plugin>
           <groupId>org.eclipse.tycho</groupId>
+          <artifactId>tycho-p2-publisher-plugin</artifactId>
+          <version>${tycho.version}</version>
+        </plugin>
+        <plugin>
+          <groupId>org.eclipse.tycho</groupId>
           <artifactId>tycho-p2-repository-plugin</artifactId>
           <version>${tycho.version}</version>
         </plugin>
@@ -173,12 +178,12 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-resources-plugin</artifactId>
-          <version>2.4</version>
+          <version>3.1.0</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-antrun-plugin</artifactId>
-          <version>1.7</version>
+          <version>1.8</version>
         </plugin>
       </plugins>
     </pluginManagement>
diff --git a/repository/pom.xml b/repository/pom.xml
index 97782e8..bed23c9 100644
--- a/repository/pom.xml
+++ b/repository/pom.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-   Copyright (c) 2014, 2019 1C-Soft LLC and others.
+   Copyright (c) 2014, 2020 1C-Soft LLC and others.
 
    This program and the accompanying materials are made available under
    the terms of the Eclipse Public License 2.0 which is available at
@@ -29,7 +29,7 @@
     <handly.version.service>0</handly.version.service>
     <handly.version>${handly.version.major}.${handly.version.minor}.${handly.version.service}.${buildQualifier}</handly.version>
     <ant-optional.version>1.5.3-1</ant-optional.version>
-    <ant-xalan2.version>1.9.4</ant-xalan2.version>
+    <ant-xalan2.version>1.10.7</ant-xalan2.version>
   </properties>
   <build>
     <plugins>