Bump echo-server to 2025-07-27T22-12-00

Author: gesellix

plugin/src/test/java/de/gesellix/gradle/docker/testutil/TestImage.java

@@ -16,7 +16,7 @@ public TestImage(DockerClient dockerClient) {
 
     this.isWindows = Objects.requireNonNull(dockerClient.version().getContent().getOs()).equalsIgnoreCase("windows");
     this.repository = "gesellix/echo-server";
-    this.tag = "2024-07-28T18-30-00";
+    this.tag = "2025-07-27T22-12-00";
 
     // TODO consider NOT calling prepare inside the constructor
     prepare();