Update copyright to 2025

Author: roji

Directory.Build.props

@@ -14,7 +14,7 @@
     <ImplicitUsings>true</ImplicitUsings>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
 
-    <Copyright>Copyright 2024 © The Npgsql Development Team</Copyright>
+    <Copyright>Copyright 2025 © The Npgsql Development Team</Copyright>
     <Company>Npgsql</Company>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <PackageLicenseExpression>PostgreSQL</PackageLicenseExpression>