[skip ci] Mark Gretty as maintained in 2026

Author: boris-petrov

README.md

@@ -1,7 +1,7 @@
 ![logo](https://akhikhl.github.io/gretty/media/gretty_logo_1.x.png "gretty logo")
 
 ![Build Status](https://github.com/gretty-gradle-plugin/gretty/workflows/CI/badge.svg)
-![Maintenance Status](https://img.shields.io/maintenance/yes/2025.svg)
+![Maintenance Status](https://img.shields.io/maintenance/yes/2026.svg)
 [![Latest release](https://img.shields.io/badge/release-4.1.10-47b31f.svg)](https://github.com/gretty-gradle-plugin/gretty/tree/v4.1.10)
 [![Snapshot](https://img.shields.io/badge/current-4.1.11--SNAPSHOT-47b31f.svg)](https://github.com/gretty-gradle-plugin/gretty/tree/master)
 [![License](https://img.shields.io/badge/license-MIT-47b31f.svg)](#copyright-and-license)