Fix a typo in a warning message in TestFixturesPlugin (#37631)

buildSrc/src/main/java/org/elasticsearch/gradle/testfixtures/TestFixturesPlugin.java

@@ -96,7 +96,7 @@ public class TestFixturesPlugin implements Plugin<Project> {
             if (dockerComposeSupported(project) == false) {
                 project.getLogger().warn(
                     "Tests for {} require docker-compose at /usr/local/bin/docker-compose or /usr/bin/docker-compose " +
-                        "but none could not be found so these will be skipped", project.getPath()
+                        "but none could be found so these will be skipped", project.getPath()
                 );
                 tasks.withType(getTaskClass("com.carrotsearch.gradle.junit4.RandomizedTestingTask"), task ->
                     task.setEnabled(false)