fix: Ensure TableTestFormatterFunc uses fresh EditorConfigProvider

The issue is that when editoconfig changes, it was not captured by the
formatter function, because the `EditorConfigProvider` was static.
And currently `EditorConfigProvider` uses internally an ec4j
"permanent" cache:

```
ResourcePropertiesService.builder().cache(Caches.permanent()).build();
```

Author: bric3

lib/src/tableTestFormatter/java/com/diffplug/spotless/glue/java/TableTestFormatterFunc.java

@@ -29,7 +29,7 @@
  */
 public class TableTestFormatterFunc implements FormatterFunc.NeedsFile {
 
-	private static final EditorConfigProvider CONFIG_PROVIDER = new EditorConfigProvider();
+	private final EditorConfigProvider CONFIG_PROVIDER = new EditorConfigProvider();
 
 	private final SourceFileFormatter sourceFormatter = new SourceFileFormatter();
 	private final TableTestFormatter tableFormatter = new TableTestFormatter();

testlib/src/main/resources/java/tableTestFormatter/JavaCodeFormattedWith2SpaceIndent.test

@@ -0,0 +1,13 @@
+import org.tabletest.junit.TableTest;
+
+class CalculatorTest {
+
+    @TableTest("""
+      scenario | a  | b  | sum?
+      positive | 1  | 2  | 3
+      negative | -1 | -2 | -3
+      """)
+    void shouldAddNumbers(int a, int b, int sum) {
+        assert a + b == sum;
+    }
+}

testlib/src/test/java/com/diffplug/spotless/java/TableTestFormatterStepTest.java

@@ -43,6 +43,37 @@ void behaviorTableFile() {
 		}
 	}
 
+	@Test
+	void editorConfigChangesAreHonored() {
+		// Verifies that a new FormatterStep picks up .editorconfig changes rather than
+		// returning stale results from a shared cache.
+		//
+		// Two steps with the same version share a classloader (via SpotlessCache's
+		// serialization-based key). If EditorConfigProvider were stored as a static field,
+		// its permanent ec4j cache would survive across FormatterFunc instances, and the
+		// second step would still see the indent_size=4 result cached by the first step.
+		// Making EditorConfigProvider an instance field ensures each FormatterFunc gets a
+		// fresh provider with an empty cache.
+
+		// Step 1: .editorconfig with indent_size=4
+		setFile(".editorconfig").toContent("[*.java]\nindent_size = 4\n");
+		FormatterStep step1 = TableTestFormatterStep.create(VERSION, TestProvisioner.mavenCentral());
+		try (StepHarnessWithFile harness = StepHarnessWithFile.forStep(this, step1)) {
+			harness.testResource("CalculatorTest.java",
+					"java/tableTestFormatter/JavaCodeUnformatted.test",
+					"java/tableTestFormatter/JavaCodeFormatted.test");
+		}
+
+		// Step 2: change .editorconfig to indent_size=2, create a new step
+		setFile(".editorconfig").toContent("[*.java]\nindent_size = 2\n");
+		FormatterStep step2 = TableTestFormatterStep.create(VERSION, TestProvisioner.mavenCentral());
+		try (StepHarnessWithFile harness = StepHarnessWithFile.forStep(this, step2)) {
+			harness.testResource("CalculatorTest.java",
+					"java/tableTestFormatter/JavaCodeUnformatted.test",
+					"java/tableTestFormatter/JavaCodeFormattedWith2SpaceIndent.test");
+		}
+	}
+
 	@Test
 	void equality() {
 		new SerializableEqualityTester() {