Output of GitlabCodeClimateReporter on Windows not compatible with GitLab

If you run pylint with --output-format=pylint_gitlab.GitlabCodeClimateReporter:codeclimate.json on Windows, the paths in the resulting JSON files contain backslashes. This breaks the hyperlinks that GitLab generates from them.

For example, when the output file contains this:

{
    "type": "issue",
    "check_name": "C0116",
    "description": "C0116: Missing function or method docstring",
    "categories": [
        "Style"
    ],
    "severity": "minor",
    "location": {
        "path": "src\\my_package\\main.py",
        "lines": {
            "begin": 535
        }
    },
    "fingerprint": "d7547a5ea6ffd6d3021e5b4ca3e24b3d5d919ac60cd27413cc594603372311f0"
}

Then the link generated in the GitLab merge request should become:

https://gitlab.com/%{project_path}/-/blob/%{commit_sha}/src/my_package/main.py#L535

but instead becomes:

https://gitlab.com/%{project_path}/-/blob/%{commit_sha}/src%5Cmy_package%5Cmain.py#L535

which GitLab doesn't resolve. Instead, it redirects you to

https://gitlab.com/%{project_path}/-/tree/%{commit_sha}#L535

and displays following error at the top of the resulting page:

"src\my_package\main.py" did not exist on "%{commit_sha}"