Polish "Fix broken AnsiOutput.detectIfAnsiCapable on JDK22"

See gh-40172

Author: mhalbritter

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ansi/AnsiOutput.java

@@ -157,13 +157,13 @@ private static boolean detectIfAnsiCapable() {
 				return false;
 			}
 			if (consoleAvailable == null) {
-				Console c = System.console();
-				if (c == null) {
+				Console console = System.console();
+				if (console == null) {
 					return false;
 				}
 				Method isTerminalMethod = ClassUtils.getMethodIfAvailable(Console.class, "isTerminal");
 				if (isTerminalMethod != null) {
-					Boolean isTerminal = (Boolean) isTerminalMethod.invoke(c);
+					Boolean isTerminal = (Boolean) isTerminalMethod.invoke(console);
 					if (Boolean.FALSE.equals(isTerminal)) {
 						return false;
 					}

spring-boot-tests/spring-boot-integration-tests/spring-boot-console-tests/src/intTest/java/org/springframework/boot/console/ConsoleIntegrationTests.java

@@ -54,7 +54,7 @@ class ConsoleIntegrationTests {
 	void runJarOn17() {
 		try (GenericContainer<?> container = createContainer(JDK_17_RUNTIME)) {
 			container.start();
-			assertThat(this.output.toString(StandardCharsets.ISO_8859_1)).contains("System.console() is null")
+			assertThat(this.output.toString(StandardCharsets.UTF_8)).contains("System.console() is null")
 				.doesNotContain(ENCODE_START);
 		}
 	}
@@ -63,7 +63,7 @@ void runJarOn17() {
 	void runJarOn22() {
 		try (GenericContainer<?> container = createContainer(JDK_22_RUNTIME)) {
 			container.start();
-			assertThat(this.output.toString(StandardCharsets.ISO_8859_1)).doesNotContain("System.console() is null")
+			assertThat(this.output.toString(StandardCharsets.UTF_8)).doesNotContain("System.console() is null")
 				.doesNotContain(ENCODE_START);
 		}
 	}