Tests: Update jQuery Migrate from 3.3.0 to 3.3.1

That upgrade makes UI pass the whole test suite without a single jQuery Migrate
warning. 🎉

Closes gh-1932

Author: mgol

Gruntfile.js

@@ -430,8 +430,8 @@ grunt.initConfig( {
 				"jquery-migrate-1.4.1/jquery-migrate.js": "jquery-migrate-1.4.1/dist/jquery-migrate.js",
 				"jquery-migrate-1.4.1/LICENSE.txt": "jquery-migrate-1.4.1/LICENSE.txt",
 
-				"jquery-migrate-3.3.0/jquery-migrate.js": "jquery-migrate-3.3.0/dist/jquery-migrate.js",
-				"jquery-migrate-3.3.0/LICENSE.txt": "jquery-migrate-3.3.0/LICENSE.txt"
+				"jquery-migrate-3.3.1/jquery-migrate.js": "jquery-migrate-3.3.1/dist/jquery-migrate.js",
+				"jquery-migrate-3.3.1/LICENSE.txt": "jquery-migrate-3.3.1/LICENSE.txt"
 			}
 		}
 	},

bower.json

@@ -67,6 +67,6 @@
 		"jquery-3.5.0": "jquery#3.5.0",
 		"jquery-3.5.1": "jquery#3.5.1",
 		"jquery-migrate-1.4.1": "https://registry.npmjs.org/jquery-migrate/-/jquery-migrate-1.4.1.tgz",
-		"jquery-migrate-3.3.0": "https://registry.npmjs.org/jquery-migrate/-/jquery-migrate-3.3.0.tgz"
+		"jquery-migrate-3.3.1": "https://registry.npmjs.org/jquery-migrate/-/jquery-migrate-3.3.1.tgz"
 	}
 }

external/jquery-migrate-3.3.0/LICENSE.txt renamed to external/jquery-migrate-3.3.1/LICENSE.txt

@@ -1,5 +1,5 @@
 /*!
- * jQuery Migrate - v3.3.0 - 2020-05-05T01:57Z
+ * jQuery Migrate - v3.3.1 - 2020-06-25T01:07Z
  * Copyright OpenJS Foundation and other contributors
  */
 ( function( factory ) {
@@ -24,7 +24,7 @@
 } )( function( jQuery, window ) {
 "use strict";
 
-jQuery.migrateVersion = "3.3.0";
+jQuery.migrateVersion = "3.3.1";
 
 // Returns 0 if v1 == v2, -1 if v1 < v2, 1 if v1 > v2
 function compareVersions( v1, v2 ) {
@@ -469,14 +469,19 @@ function isAutoPx( prop ) {
 oldFnCss = jQuery.fn.css;
 
 jQuery.fn.css = function( name, value ) {
-	var origThis = this;
-	if ( typeof name !== "string" ) {
+	var camelName,
+		origThis = this;
+	if ( name && typeof name === "object" && !Array.isArray( name ) ) {
 		jQuery.each( name, function( n, v ) {
 			jQuery.fn.css.call( origThis, n, v );
 		} );
 	}
-	if ( typeof value === "number" && !isAutoPx( camelCase( name ) ) ) {
-		migrateWarn( "Use of number-typed values is deprecated in jQuery.fn.css" );
+	if ( typeof value === "number" ) {
+		camelName = camelCase( name );
+		if ( !isAutoPx( camelName ) && !jQuery.cssNumber[ camelName ] ) {
+			migrateWarn( "Number-typed values are deprecated for jQuery.fn.css( \"" +
+				name + "\", value )" );
+		}
 	}
 
 	return oldFnCss.apply( this, arguments );
@@ -725,19 +730,11 @@ jQuery.htmlPrefilter = function( html ) {
 var oldOffset = jQuery.fn.offset;
 
 jQuery.fn.offset = function() {
-	var docElem,
-		elem = this[ 0 ],
-		bogus = { top: 0, left: 0 };
+	var elem = this[ 0 ];
 
-	if ( !elem || !elem.nodeType ) {
+	if ( elem && ( !elem.nodeType || !elem.getBoundingClientRect ) ) {
 		migrateWarn( "jQuery.fn.offset() requires a valid DOM element" );
-		return undefined;
-	}
-
-	docElem = ( elem.ownerDocument || window.document ).documentElement;
-	if ( !jQuery.contains( docElem, elem ) ) {
-		migrateWarn( "jQuery.fn.offset() requires an element connected to a document" );
-		return bogus;
+		return arguments.length ? this : undefined;
 	}
 
 	return oldOffset.apply( this, arguments );

external/jquery-migrate-3.3.0/jquery-migrate.js renamed to external/jquery-migrate-3.3.1/jquery-migrate.js

@@ -123,7 +123,7 @@ function migrateUrl() {
 	if ( jqueryVersion === "git" ) {
 		url = "https://code.jquery.com/jquery-migrate-git";
 	} else if ( jqueryVersion[ 0 ] === "3" ) {
-		url = "../../../external/jquery-migrate-3.3.0/jquery-migrate";
+		url = "../../../external/jquery-migrate-3.3.1/jquery-migrate";
 	} else if ( jqueryVersion[ 0 ] === "1" || jqueryVersion[ 0 ] === "2" ) {
 		url = "../../../external/jquery-migrate-1.4.1/jquery-migrate";
 	} else if ( jqueryVersion === "custom" ) {