Update dependency karma-firefox-launcher to v2

This MR contains the following updates:

Package	Type	Update	Change
karma-firefox-launcher	devDependencies	major	1.3.0 -> 2.1.2

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Release Notes

karma-runner/karma-firefox-launcher

v2.1.2

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Bug Fixes

• launcher does not kill firefox.exe on WSL (3954ad4), closes /github.com/karma-runner/karma-firefox-launcher/issues/101#issuecomment-891850143

v2.1.1

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Bug Fixes

• update name of Developer Edition on macOS (a0b5e58)

v2.1.0

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Features

• provide a way to configure location of executable in customLauncher (fix #​125) (c53efcc)

v2.0.0

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Bug Fixes

• Bypass WSL check if Firefox is present in WSL environment (23a5d10), closes #​107
• Update is-wsl to v2.2.0 to detect docker under WSL (#​116) (c585393)

Features

• Make Node 10 minimum required version (480dafd), closes #​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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