fix: address file URL path regression on Windows

[clemyan]

Fixes #143. This is a breaking change due to bumping of minimum supported Node version from 10.10.0 to 10.12.0.

Test results:

Test suite	OS	Node version	Before	After
c8	Windows 10	10.24.1	Failing (2)	Failing (2)
c8	Windows 10	12.22.1	Passing	Passing
c8	Windows 10	14.16.1	Passing	Passing
c8	Windows 10	15.14.0	Failing (6)	Passing
c8	Windows 10	16.1.0	Failing (6)	Passing
v8-to-istanbul	Windows 10	10.24.1	Failing (3)	Passing
v8-to-istanbul	Windows 10	12.22.1	Failing (3)	Passing
v8-to-istanbul	Windows 10	14.16.1	Failing (3)	Passing
v8-to-istanbul	Windows 10	15.14.0	Failing (3)	Passing
c8	Alpine Linux (docker)	10.24.1	Passing	Passing
c8	Alpine Linux (docker)	12.22.1	Passing	Passing
c8	Alpine Linux (docker)	14.16.1	Passing	Passing
c8	Alpine Linux (docker)	15.14.0	Passing	Passing
c8	Alpine Linux (docker)	16.0.0	Passing	Passing
v8-to-istanbul	Alpine Linux (docker)	10.24.1	Passing	Passing
v8-to-istanbul	Alpine Linux (docker)	12.22.1	Passing	Passing
v8-to-istanbul	Alpine Linux (docker)	14.16.1	Passing	Passing
v8-to-istanbul	Alpine Linux (docker)	15.14.0	Passing	Passing

• The 2 failing cases in c8 WIndows Node 10.24.1 seems to be due to coverage percentages shifting slightly. Haven't look into why but does not seem to be directly related to this fix.
• The v8-to-istanbul test suite does not run at all with Node 16 due to issue with tap@14

[SimenB]

10 is EOL, just drop it entirely and only support 12+ since we already need to do a major?

[clemyan]

I don't mind either way, but seems like @bcoe still needs Node 10 support. 🤷‍♂️ See #143 (comment).

[SimenB]

hah. my condolences 😀

(that said: jestjs/jest#11167 (comment))

[bcoe]

I'm going to go ahead and land this as a breaking change, I'm fine with the requirement for Node 10.12, and it means my team can keep using c8 until we drop Node 10 (hopefully in the next couple months).

[bcoe]

@clemyan thank you for the contribution, released in v8.0.0.