Consider time in BuildInfo up-to-date checks and allow it to be set

Closes gh-12111
Closes gh-12266

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/BuildInfoMojo.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.maven;
 
 import java.io.File;
+import java.time.Instant;
 import java.util.Map;
 
 import org.apache.maven.plugin.AbstractMojo;
@@ -71,7 +72,8 @@ public class BuildInfoMojo extends AbstractMojo {
 			new BuildPropertiesWriter(this.outputFile)
 					.writeBuildProperties(new ProjectDetails(this.project.getGroupId(),
 							this.project.getArtifactId(), this.project.getVersion(),
-							this.project.getName(), this.additionalProperties));
+							this.project.getName(), Instant.now(),
+							this.additionalProperties));
 			this.buildContext.refresh(this.outputFile);
 		}
 		catch (NullAdditionalPropertyValueException ex) {