Use matching version of @tiptap/core and extentions

--- a/package.json
+++ b/package.json
@@ -65,24 +65,24 @@
     "@rails/ujs": "6.1.3-2",
     "@sentry/browser": "5.26.0",
     "@sourcegraph/code-host-integration": "0.0.59",
-    "@tiptap/core": "^2.0.0-beta.86",
-    "@tiptap/extension-blockquote": "^2.0.0-beta.14",
+    "@tiptap/core": "2.0.0-beta.86",
+    "@tiptap/extension-blockquote": "2.0.0-beta.14",
     "@tiptap/extension-bold": "^2.0.0-beta.14",
-    "@tiptap/extension-bullet-list": "^2.0.0-beta.14",
+    "@tiptap/extension-bullet-list": "2.0.0-beta.14",
     "@tiptap/extension-code": "^2.0.0-beta.14",
     "@tiptap/extension-code-block-lowlight": "2.0.0-beta.32",
     "@tiptap/extension-document": "^2.0.0-beta.12",
     "@tiptap/extension-dropcursor": "^2.0.0-beta.17",
     "@tiptap/extension-gapcursor": "^2.0.0-beta.18",
     "@tiptap/extension-hard-break": "^2.0.0-beta.14",
-    "@tiptap/extension-heading": "^2.0.0-beta.14",
+    "@tiptap/extension-heading": "2.0.0-beta.14",
     "@tiptap/extension-history": "^2.0.0-beta.14",
     "@tiptap/extension-horizontal-rule": "^2.0.0-beta.17",
     "@tiptap/extension-image": "^2.0.0-beta.14",
     "@tiptap/extension-italic": "^2.0.0-beta.14",
     "@tiptap/extension-link": "^2.0.0-beta.18",
     "@tiptap/extension-list-item": "^2.0.0-beta.13",
-    "@tiptap/extension-ordered-list": "^2.0.0-beta.14",
+    "@tiptap/extension-ordered-list": "2.0.0-beta.14",
     "@tiptap/extension-paragraph": "^2.0.0-beta.15",
     "@tiptap/extension-strike": "^2.0.0-beta.16",
     "@tiptap/extension-subscript": "^2.0.0-beta.4",
@@ -91,8 +91,8 @@
     "@tiptap/extension-table-cell": "^2.0.0-beta.13",
     "@tiptap/extension-table-header": "^2.0.0-beta.15",
     "@tiptap/extension-table-row": "^2.0.0-beta.13",
-    "@tiptap/extension-task-item": "^2.0.0-beta.17",
-    "@tiptap/extension-task-list": "^2.0.0-beta.17",
+    "@tiptap/extension-task-item": "2.0.0-beta.17",
+    "@tiptap/extension-task-list": "2.0.0-beta.17",
     "@tiptap/extension-text": "^2.0.0-beta.12",
     "@tiptap/vue-2": "^2.0.0-beta.39",
     "@toast-ui/editor": "^2.5.2",