Remove unused code

Issue gh-9203

Author: zeeshanadnan

web/src/main/java/org/springframework/security/web/savedrequest/CookieRequestCache.java

@@ -29,7 +29,6 @@
 import org.springframework.security.web.util.matcher.AnyRequestMatcher;
 import org.springframework.security.web.util.matcher.RequestMatcher;
 import org.springframework.util.Assert;
-import org.springframework.util.MultiValueMap;
 import org.springframework.util.StringUtils;
 import org.springframework.web.util.UriComponents;
 import org.springframework.web.util.UriComponentsBuilder;
@@ -77,7 +76,6 @@ public SavedRequest getRequest(HttpServletRequest request, HttpServletResponse r
 		UriComponents uriComponents = UriComponentsBuilder.fromUriString(originalURI).build();
 		DefaultSavedRequest.Builder builder = new DefaultSavedRequest.Builder();
 		int port = getPort(uriComponents);
-		MultiValueMap<String, String> queryParams = uriComponents.getQueryParams();
 		return builder.setScheme(uriComponents.getScheme()).setServerName(uriComponents.getHost())
 				.setRequestURI(uriComponents.getPath()).setQueryString(uriComponents.getQuery()).setServerPort(port)
 				.setMethod(request.getMethod()).build();