Fix launch script integration tests on Intel Macs

Closes gh-36799

Author: wilkinsona

spring-boot-tests/spring-boot-integration-tests/spring-boot-launch-script-tests/src/intTest/java/org/springframework/boot/launchscript/AbstractLaunchScriptIntegrationTests.java

@@ -164,6 +164,7 @@ static Architecture current() {
 			}
 			switch (arch) {
 				case "amd64":
+				case "x86_64":
 					return AMD64;
 				case "aarch64":
 					return AARCH64;