Bump tinymce-a11y-checker to 3.3.4

This new version includes a fix to add consistency
to the header length check

Closes MAT-655
flag=none

Test Plan:
- Run a yarn install in Canvas and re-build JS
  bundles
- Navigate to an RCE and insert a heading with length
  121
- Verify the a11y checker notifies of the error
- Change the heading length to 120
- Verify the a11y checker does not complain about
  the length

Change-Id: I0671fe7357a3bdd9f7fd327f57faaf13fec2cbe8
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/285220
Product-Review: David Lyons <lyons@instructure.com>
Reviewed-by: Juan Chavez <juan.chavez@instructure.com>
QA-Review: Juan Chavez <juan.chavez@instructure.com>
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>

package.json

@@ -173,7 +173,7 @@
     "tablesorter": "^2.28.5",
     "timezone": "https://registry.npmjs.org/@brentburgoyne/timezone/-/timezone-1.0.24.tgz",
     "tinycolor2": "1.4.1",
-    "tinymce-a11y-checker": "^3.3.3",
+    "tinymce-a11y-checker": "^3.3.4",
     "use-debounce": "^3",
     "use-media-set": "^1.1",
     "uuid": "^3.2.1",

packages/canvas-rce/package.json

@@ -135,7 +135,7 @@
     "redux-thunk": "^2",
     "scroll-into-view": "https://github.com/bkirkby/scroll-into-view.git#588b0ced98eeecf84e6fb2074aa076e80b7cffab",
     "tinymce": "^5",
-    "tinymce-a11y-checker": "^3.3.3"
+    "tinymce-a11y-checker": "^3.3.4"
   },
   "devDependencies": {
     "@babel/cli": "^7",

yarn.lock

@@ -24528,10 +24528,10 @@ tinycolor2@^1.4.1:
   resolved "https://registry.yarnpkg.com/tinycolor2/-/tinycolor2-1.4.2.tgz#3f6a4d1071ad07676d7fa472e1fac40a719d8803"
   integrity sha512-vJhccZPs965sV/L2sU4oRQVAos0pQXwsvTLkWYdqJ+a8Q5kPFzJTuOFwy7UniPli44NKQGAglksjvOcpo95aZA==
 
-tinymce-a11y-checker@^3.3.3:
-  version "3.3.3"
-  resolved "https://registry.yarnpkg.com/tinymce-a11y-checker/-/tinymce-a11y-checker-3.3.3.tgz#5e6ab67817c46690f38d03836d1772d924e0cfd8"
-  integrity sha512-BML0pgS+CVp1mfhuhceiJh/0pYbObk17jY+5lzo/bM7eFLNImWsgPUxcHfYLqyJQOHU2/OxCU4S+DsZ0DHKNiQ==
+tinymce-a11y-checker@^3.3.4:
+  version "3.3.4"
+  resolved "https://registry.yarnpkg.com/tinymce-a11y-checker/-/tinymce-a11y-checker-3.3.4.tgz#1419ebd911e08ee5851ef470b2d12ffa87d23c7e"
+  integrity sha512-NMfvdPASHumy9G35d4nGLDYuKMBjQ7U2ezXJzAJC4lnkvVW9ktA/Lj2NgVSuu6ipKoEXCqRFFDKRNZNvvsGheg==
   dependencies:
     "@instructure/canvas-theme" "^7.6.0"
     "@instructure/ui-a11y-content" "^7.6.0"