[Snyk] Upgrade mocha from 8.3.0 to 8.3.1

Snyk has created this PR to upgrade mocha from 8.3.0 to 8.3.1.

merge advice :information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

The recommended version is 1 version ahead of your current version.
The recommended version was released 22 days ago, on 2021-03-06.

Release notes

Package name: mocha

8.3.1 - 2021-03-06
8.3.1 / 2021-03-06

🐛 Fixes
- #4577: Browser: fix EvalError caused by regenerator-runtime (@ snoack)
- #4574: ESM: allow import from mocha in parallel mode (@ nicojs)
8.3.0 - 2021-02-11
8.3.0 / 2021-02-11

🎉 Enhancements
- #4506: Add error code for test timeout errors (@ boneskull)
- #4112: Add BigInt support to stringify util function (@ JosejeSinohui)
🐛 Fixes
- #4557: Add file location when SyntaxError happens in ESM (@ giltayar)
- #4521: Fix require error when bundling Mocha with Webpack (@ devhazem)
📖 Documentation
- #4507: Add support for typescript-style docstrings (@ boneskull)
- #4503: Add GH Actions workflow status badge (@ outsideris)
- #4494: Add example of generating tests dynamically with a closure (@ maxwellgerber)
🔩 Other
- #4556: Upgrade all dependencies to latest stable (@ AviVahl)
- #4543: Update dependencies yargs and yargs-parser (@ juergba)
Also thanks to @ outsideris and @ HyunSangHan for various fixes to our website and documentation.