build: Make build reproducible

pom.xml

@@ -25,7 +25,7 @@
     <parent>
         <groupId>org.kordamp.maven</groupId>
         <artifactId>kordamp-parent</artifactId>
-        <version>1.4.0</version>
+        <version>1.5.0</version>
     </parent>
 
     <artifactId>pomchecker</artifactId>
@@ -40,15 +40,14 @@
         <java.version>1.8</java.version>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
+        <!-- value comes from property git.commit.author.time -->
+        <project.build.outputTimestamp>${git.commit.author.time}</project.build.outputTimestamp>
         <slf4j.version>2.0.6</slf4j.version>
         <picocli.version>4.7.1</picocli.version>
         <sisu.version>0.9.0.M1</sisu.version>
         <maven.version>3.9.0</maven.version>
         <maven.resolver.version>1.9.7</maven.resolver.version>
         <commons.lang3.version>3.12.0</commons.lang3.version>
-        <version.compiler.plugin>3.11.0</version.compiler.plugin>
-        <version.deploy.plugin>3.1.0</version.deploy.plugin>
-        <version.javadoc.plugin>3.5.0</version.javadoc.plugin>
     </properties>
 
     <name>pomchecker</name>