Update mongo shell

[luandy64]

Description of change

This PR removes the workaround added in #73.

The goal of #73 was to fix a seemingly random loss of curl being installed in the Docker container.

I noticed that libcurl3 was being installed as part of the "Setup Mongo" step. Some googling led me to learn that libcurl3 cannot be installed with libcurl4, which is used by curl. So it appears that installing libcurl3 also caused curl to be uninstalled since it's missing a dependency.

I followed Mongo's instructions to just install a newer version of the mongo shell. Docs here

QA steps

• automated tests passing
• manual qa steps passing (list below)

Risks

I'm not sure why we pinned the mongo version. But if we are using it to just run a few queries to set up the database, it seems safe to bump the version.

Note that we bumping from version 4.2 to 5.0. I'm unaware of any breaking changes here.

Rollback steps

• revert this branch

[kspeer825]

sick