chore: migrate to new versions of prosemirror packages (#2854)

* refactor: upgrade prosemirror packages to new typescript versions

* refactor: migrate to new typings from prosemirror

* style: fix linting issues

* style: fix linting issues

* style: fix linting issues

* fix(ci): fix build process by reimplement filterTransaction

* fix(extension-test): fix broken build because of wrong output file names

* fix: fix prosemirror-tables not being bundled correctly for ES6

* fix: move to prosemirror-tables-contently until es6 build is working

* fix: fix tests for youtube

* fix: fix youtube test

* fix(demos): fix demos build

packages/core/src/extensions/tabindex.ts

@@ -10,13 +10,7 @@ export const Tabindex = Extension.create({
       new Plugin({
         key: new PluginKey('tabindex'),
         props: {
-          attributes: () => {
-            if (this.editor.isEditable) {
-              return {
-                tabindex: '0',
-              }
-            }
-          },
+          attributes: this.editor.isEditable ? { tabindex: '0' } : {},
         },
       }),
     ]