Update mocha to v.10.2.0

`mocha` `5.1.0 - 9.2.1`
Depends on vulnerable versions of `yargs-unparser <=1.6.3`
which depends on vulnerable versions of `flat` `<5.0.1`
`flat` vulnerable to Prototype Pollution - https://github.com/advisories/GHSA-2j2x-2gpw-g8fm

Upgrading `mocha` will also help upgrade `minimatch`
`minimatch <3.0.5` which has ReDoS vulnerability - https://github.com/advisories/GHSA-f8q6-p94x-37v3

Start by locating the project's mocha dependency and the associated dependency metadata. Update mocha to v10.2.0, then verify that the vulnerable yargs-unparser/flat and minimatch versions are no longer included and that the existing JavaScript tests still pass.

Written by the indexing model from the issue text.