Update the ESLint dependencies, and also tweak the no-multiple-empty-lines rules

Since multiple empty lines is virtually unused in the code-base, and the few cases that do exist look like "typos", let's enforce greater consistency here; please see https://eslint.org/docs/rules/no-multiple-empty-lines.

src/core/font_renderer.js

@@ -676,7 +676,6 @@ var FontRendererFactory = (function FontRendererFactoryClosure() {
     },
   });
 
-
   return {
     create: function FontRendererFactory_create(font, seacAnalysisEnabled) {
       var data = new Uint8Array(font.data);