Pin Tooling-API client default to Gradle 8.14.3

8.14.4 has a Kotlin DSL regression that breaks `plugins {}` blocks with
local `val` declarations (16 :rewrite-gradle:test failures); 8.14.3 has
no such regression and matches the pre-#7534 default for Java < 25.

Author: timtebeek

rewrite-gradle-tooling-model/model/src/main/java/org/openrewrite/gradle/toolingapi/OpenRewriteModelBuilder.java

@@ -83,7 +83,7 @@ public static OpenRewriteModel forProjectDirectory(File projectDir, @Nullable Fi
             gradleVersion = wrapperGradleVersion(projectDir.toPath().resolve("gradle/wrapper/gradle-wrapper.properties"));
             connector.useBuildDistribution();
         } else {
-            gradleVersion = System.getProperty("org.openrewrite.test.gradleVersion", "8.14.4");
+            gradleVersion = System.getProperty("org.openrewrite.test.gradleVersion", "8.14.3");
             connector.useGradleVersion(gradleVersion);
         }
         connector