Override isAcceptable in ChangeDependency outer visitor

The conversion to ScanningRecipe in #6858 introduced a wrapper
TreeVisitor that did not override isAcceptable(), causing it to
inherit the default TreeVisitor.isAcceptable() which returns true
for all files. This made every Gradle recipe's isAcceptable check
pass for non-Gradle files like plain text and Java sources.

Add isAcceptable() to the outer visitor that checks for the
GradleProject marker for Gradle files and accepts only
gradle.properties for Properties files.

Author: Jenson3210

rewrite-gradle/src/main/java/org/openrewrite/gradle/ChangeDependency.java

@@ -464,6 +464,14 @@ private GradleProject updateGradleModel(GradleProject gp, ExecutionContext ctx)
 
         DependencyMatcher propsMatcher = requireNonNull(DependencyMatcher.build(oldGroupId + ":" + oldArtifactId).getValue());
         return new TreeVisitor<Tree, ExecutionContext>() {
+            @Override
+            public boolean isAcceptable(SourceFile sourceFile, ExecutionContext ctx) {
+                if (sourceFile instanceof Properties.File) {
+                    return sourceFile.getSourcePath().endsWith(GRADLE_PROPERTIES_FILE_NAME) && !acc.versionVariableUpdates.isEmpty();
+                }
+                return sourceFile.getMarkers().findFirst(GradleProject.class).isPresent();
+            }
+
             @Override
             public @Nullable Tree visit(@Nullable Tree tree, ExecutionContext ctx) {
                 if (tree instanceof Properties.File) {

rewrite-gradle/src/test/java/org/openrewrite/gradle/ChangeDependencyTest.java

@@ -17,8 +17,15 @@
 
 import org.junit.jupiter.api.Test;
 import org.openrewrite.DocumentExample;
+import org.openrewrite.ExecutionContext;
+import org.openrewrite.InMemoryExecutionContext;
+import org.openrewrite.SourceFile;
+import org.openrewrite.TreeVisitor;
 import org.openrewrite.test.RecipeSpec;
 import org.openrewrite.test.RewriteTest;
+import org.openrewrite.text.PlainTextParser;
+
+import java.nio.file.Path;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.openrewrite.gradle.Assertions.buildGradle;
@@ -1061,4 +1068,18 @@ void sharedKotlinDslStringTemplateVersionVariableCollapsesToLiteral() {
           )
         );
     }
+
+    @Test
+    void isAcceptable() {
+        ChangeDependency recipe = new ChangeDependency(
+                "org.old", "artifact", "org.new", "artifact", null, null, null
+        );
+        @SuppressWarnings("unchecked")
+        TreeVisitor<?, ExecutionContext> visitor = (TreeVisitor<?, ExecutionContext>) recipe.getVisitor();
+
+        SourceFile sourceFile = PlainTextParser.builder().build().parse("not a gradle file")
+                .findFirst().orElseThrow()
+                .withSourcePath(Path.of("not-a-gradle-file.txt"));
+        assertThat(visitor.isAcceptable(sourceFile, new InMemoryExecutionContext())).isFalse();
+    }
 }