[bug] Remove replace directive for go-git module

[caitlinelfring]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features) see docs/README.md

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
Bug fix

What is the current behavior? (You can also link to an open issue here)
go install fails due to the replace directive. See #181

go install: github.com/get-woke/woke@latest (in github.com/get-woke/woke@v0.18.0):
	The go.mod file for the module providing named packages contains one or
	more replace directives. It must not contain directives that would cause
	it to be interpreted differently than if it were the main module.

What is the new behavior (if this is a feature change)?
Switch to a forked version of go-git with the correct module name to avoid needing the replace directive.

Does this PR introduce a breaking change? (What changes might users need to make due to this PR?)
No

Other information:
A followup PR to switch back to the original module will be needed once inclusive-dev-tools/go-git#1 has been merged