chore(deps): update dependency karma-firefox-launcher to v2.1.2

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
karma-firefox-launcher	2.1.1 -> 2.1.2

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Release Notes

karma-runner/karma-firefox-launcher

v2.1.2

Compare Source

Bug Fixes

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

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