Fix Dependabot alerts #28

[smoy]

What changed?

• When we run on Windows, and GIT_PYTHON_GIT_EXECUTABLE is not set in environment variable, raise the exception.

Rationale

• GitPython untrusted search path on Windows systems leading to arbitrary code execution

How was it tested?

If it was manually verified, list the instructions for your reviewers to follow.

• [ ] Unit Tests
• [ ] Functional Tests
• [ ] Manually Verified

[codecov[bot]]

Codecov Report

Patch coverage: 50.00% and project coverage change: -3.72% :warning:

Comparison is base (dfcd725) 82.95% compared to head (403f71d) 79.24%. Report is 5 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #628 +/- ## ========================================== - Coverage 82.95% 79.24% -3.72% ========================================== Files 105 106 +1 Lines 12588 13690 +1102 ========================================== + Hits 10443 10848 +405 - Misses 2145 2842 +697 ``` | [Flag](https://app.codecov.io/gh/noqdev/iambic/pull/628/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | Coverage Δ | | |---|---|---| | [functional_tests](https://app.codecov.io/gh/noqdev/iambic/pull/628/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | `64.01% <50.00%> (-1.94%)` | :arrow_down: | | [functional_tests_config_discovery](https://app.codecov.io/gh/noqdev/iambic/pull/628/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | `45.77% <0.00%> (-0.18%)` | :arrow_down: | | [unit_tests](https://app.codecov.io/gh/noqdev/iambic/pull/628/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | `73.22% <50.00%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files Changed](https://app.codecov.io/gh/noqdev/iambic/pull/628?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | Coverage Δ | | |---|---|---| | [iambic/core/git.py](https://app.codecov.io/gh/noqdev/iambic/pull/628?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev#diff-aWFtYmljL2NvcmUvZ2l0LnB5) | `78.97% <50.00%> (-0.68%)` | :arrow_down: | ... and [7 files with indirect coverage changes](https://app.codecov.io/gh/noqdev/iambic/pull/628/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev)

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