Add timestamp for reproduceable builds.

Author: david-waltermire

pom.xml

@@ -99,6 +99,7 @@
 
 		<timestamp>${maven.build.timestamp}</timestamp>
 		<maven.build.timestamp.format>yyyy-MM-dd'T'HH:mm:ssZ</maven.build.timestamp.format>
+		<project.build.outputTimestamp>2023-01-01T00:00:00Z</project.build.outputTimestamp>
 
 		<dependency.antlr4.version>4.13.1</dependency.antlr4.version>
 		<dependency.auto-service.version>1.1.1</dependency.auto-service.version>