Update dependency org.apache.maven.plugins:maven-compiler-plugin to v3.9.0 (#2465)

Co-authored-by: Renovate Bot <[email protected]>
Co-authored-by: Aslak Hellesøy <[email protected]>

Author: 3 people

archetype/pom.xml

@@ -58,6 +58,7 @@
                 <artifactId>maven-resources-plugin</artifactId>
                 <configuration>
                     <escapeString>\</escapeString>
+                    <propertiesEncoding>UTF-8</propertiesEncoding>
                 </configuration>
             </plugin>
         </plugins>

archetype/src/main/resources/archetype-resources/pom.xml

@@ -63,7 +63,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
+                <version>3.9.0</version>
                 <configuration>
                     <encoding>UTF-8</encoding>
                     <source>1.8</source>

archetype/src/test/resources/projects/should-generate-project/reference/pom.xml

@@ -63,7 +63,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
+                <version>3.9.0</version>
                 <configuration>
                     <encoding>UTF-8</encoding>
                     <source>1.8</source>