fix: ensure git.hasDiff will not compare against files

[felipecrs]

Changes

This fixes a situation in which git.hasDiff may try to compare against a remote branch but there is a file with the same name. The fix resolves such ambiguity, so that git will always treat the argument as a revision spec and not a potential file.

Context

❯ git diff HEAD origin/master
[works]
❯ mkdir -p origin && touch origin/master
❯ git diff HEAD origin/master
fatal: ambiguous argument 'origin/master': both revision and filename
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
> git diff HEAD origin/master --
[works]

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[CLAassistant]

All committers have signed the CLA.

[viceice]

needs lint fix

[felipecrs]

Ops, my bad!

[JamieMagee]

This must have been a painful bug to find 😅

[felipecrs]

Prettier fixed!

[felipecrs]

The failure seems unrelated this time.

[renovate-release]

🎉 This PR is included in version 36.8.11 🎉

The release is available on:

• GitHub release
• 36.8.11

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