Sanitize duplicate slashes in request path

This commit removes duplicate slashes in the resolved lookup path when
calling `UrlPathHelper.getLookupPathForRequest`. This is especially
necessary when the path is cleaned from semicolon content and leaves
duplicate slashes in the request path.

Issue: SPR-13455

spring-web/src/main/java/org/springframework/web/util/UrlPathHelper.java

@@ -421,6 +421,7 @@ public class UrlPathHelper {
 	private String decodeAndCleanUriString(HttpServletRequest request, String uri) {
 		uri = removeSemicolonContent(uri);
 		uri = decodeRequestString(request, uri);
+		uri = getSanitizedPath(uri);
 		return uri;
 	}