Upgrade to Node 16

Closes MAT-785

Test Plan:
A bunch of regression testing! Let's make sure
RCS functionality works as before.

The easiest way to do this will be going through
each item in the toolbar (menu bar) and verfifying
requests to RCS work as before.

I also recommend we deploy to CD and do the testing
there. If you don't  have permission to do that I'm
happy to help

Change-Id: I1e999860f2d3911de065343099c85907f3c078b5
Reviewed-on: https://gerrit.instructure.com/c/canvas-rce-api/+/287718
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Juan Chavez <juan.chavez@instructure.com>
Reviewed-by: Jon Scheiding <jon.scheiding@instructure.com>
QA-Review: Juan Chavez <juan.chavez@instructure.com>
Product-Review: Weston Dransfield <wdransfield@instructure.com>

Author: westonkd

Dockerfile

@@ -1,4 +1,4 @@
-FROM instructure/node-passenger:12
+FROM instructure/node-passenger:16
 COPY --chown=docker:docker . /usr/src/app
 
 RUN npm install