[alias-server] Patch CI failures caused by Mongo Memory Server dep

Summary:
alias-server has MongoDB pegged to a version no longer supported by CI

Update the test deps for mongo and bump this version peg to fix tests in CI.

Test Plan: npm test

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D17173