Update bundler in dockerfile
Update bundler in dockerfile

Test plan:
* `docker compose build` works and updates bundler version

Change-Id: I4268eb3a5ae9b70a36263362763166bb29b3d0ae
Reviewed-on: https://gerrit.instructure.com/104181
Tested-by: Jenkins
QA-Review: Michael Hargiss <59e3fde81b8d9a4f5e0cc016a3c2695591912604@instructure.com>
Reviewed-by: Michael Hargiss <59e3fde81b8d9a4f5e0cc016a3c2695591912604@instructure.com>
Product-Review: Neil Gupta <cc4fec8a34766005dd45d48be045c08d736c11ed@instructure.com>

djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms