Fixed situations in which cwd was specified as a relative path and used with (default) commitMode: git-cli (#486)

* fix: use latest ghcommit and fix cwd for git-cli

- `cwd` was not working correctly when commitMode was set to `git-cli`,
  as it was attempting to resolve the `cwd` twice.
  (This problem only occured when specifying a relative path for `cwd`.)
- Update `ghcommit`, and avoid calling `process.chdir()` to change the
  working directory. Instead, we now pass the `cwd` option everywhere.

fixes #475

* simplify

* Apply suggestions from code review

---------

Co-authored-by: Mateusz Burzyński <mateuszburzynski@gmail.com>

.changeset/lemon-garlics-sell.md

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+"@changesets/action": patch
+---
+
+Fixed situations in which `cwd` was specified as a relative path and used with (default) `commitMode: git-cli`

.changeset/sour-elephants-switch.md

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+---