fix(git): add — after rev-parse

[rarkins]

Changes:

Add -- after git rev-parse to disambiguate.

Context:

Attempt to solve:

err.message | fatal: ambiguous argument 'origin/main': unknown revision or path not in the working tree.Use '--' to separate paths from revisions, like this:'git <command> [<revision>...] -- [<file>...]'
-- | --
err.stack | Error: fatal: ambiguous argument 'origin/main': unknown revision or path not in the working tree.Use '--' to separate paths from revisions, like this:'git <command> [<revision>...] -- [<file>...]'at GitExecutorChain.onFatalException (/home/ubuntu/renovateapp/node_modules/simple-git/src/lib/runners/git-executor-chain.js:61:87)at GitExecutorChain.<anonymous> (/home/ubuntu/renovateapp/node_modules/simple-git/src/lib/runners/git-executor-chain.js:52:28)at Generator.throw (<anonymous>)at rejected (/home/ubuntu/renovateapp/node_modules/simple-git/src/lib/runners/git-executor-chain.js:6:65)at runMicrotasks (<anonymous>)at processTicksAndRejections (internal/process/task_queues.js:97:5)
err.task.commands.0 | rev-parse
err.task.commands.1 | origin/main

This happens in forkMode when the forked repo already exists and uses master.

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 tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added unit tests, or
• Unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 24.35.1 🎉

The release is available on:

• GitHub release
• 24.35.1

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