chore(deps): update dependency karma-firefox-launcher to v2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
karma-firefox-launcher	devDependencies	major	^1.3.0 -> ^2.0.0

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Release Notes

karma-runner/karma-firefox-launcher

### [`v2.0.0`](https://togithub.com/karma-runner/karma-firefox-launcher/blob/master/CHANGELOG.md#​200-httpsgithubcomkarma-runnerkarma-firefox-launchercomparev130v200-2020-10-20) [Compare Source](https://togithub.com/karma-runner/karma-firefox-launcher/compare/v1.3.0...v2.0.0) ##### Bug Fixes - Bypass WSL check if Firefox is present in WSL environment ([23a5d10](https://togithub.com/karma-runner/karma-firefox-launcher/commit/23a5d10baeba016d4c30a7378a795de4561f1160)), closes [#​107](https://togithub.com/karma-runner/karma-firefox-launcher/issues/107) - Update is-wsl to v2.2.0 to detect docker under WSL ([#​116](https://togithub.com/karma-runner/karma-firefox-launcher/issues/116)) ([c585393](https://togithub.com/karma-runner/karma-firefox-launcher/commit/c58539341897ebbaf9ada80f3fb9a8818046b1b3)) ##### Features - Make Node 10 minimum required version ([480dafd](https://togithub.com/karma-runner/karma-firefox-launcher/commit/480dafd7d0055ed55af211af301754a9e3972ab5)), closes [#​118](https://togithub.com/karma-runner/karma-firefox-launcher/issues/118) ##### BREAKING CHANGES - Changed minimum required version of node.js from 8 to 10. Node 8 EOL was 2019-12-31.

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