Remove unused method

See gh-30655

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/flyway/FlywayAutoConfiguration.java

@@ -325,15 +325,6 @@ public class FlywayAutoConfiguration {
 			}
 		}
 
-		private boolean hasAtLeastOneLocation(ResourceLoader resourceLoader, Collection<String> locations) {
-			for (String location : locations) {
-				if (resourceLoader.getResource(normalizePrefix(location)).exists()) {
-					return true;
-				}
-			}
-			return false;
-		}
-
 		private String normalizePrefix(String location) {
 			return location.replace("filesystem:", "file:");
 		}