Bump build timestamp to 2025.

This timestamp appears in the copyright in the generated Javadoc, as well as for various filesystem timestamps, I think.

RELNOTES=n/a
PiperOrigin-RevId: 711912949

Author: cpovirk

android/pom.xml

@@ -23,7 +23,7 @@
     <jspecify.version>1.0.0</jspecify.version>
     <errorprone.version>2.36.0</errorprone.version>
     <j2objc.version>3.0.0</j2objc.version>
-    <project.build.outputTimestamp>2024-01-02T00:00:00Z</project.build.outputTimestamp>
+    <project.build.outputTimestamp>2025-01-02T00:00:00Z</project.build.outputTimestamp>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <!--
     Some tests need reflective access to the internals of these packages. It is only the

pom.xml

@@ -23,7 +23,7 @@
     <jspecify.version>1.0.0</jspecify.version>
     <errorprone.version>2.36.0</errorprone.version>
     <j2objc.version>3.0.0</j2objc.version>
-    <project.build.outputTimestamp>2024-01-02T00:00:00Z</project.build.outputTimestamp>
+    <project.build.outputTimestamp>2025-01-02T00:00:00Z</project.build.outputTimestamp>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <!--
     Some tests need reflective access to the internals of these packages. It is only the