Fix multi-file python test on Github Actions

[MartinXPN]

For some reason, the multi-file Python test case fails on the GitHub Actions machine. Yet it works fine locally and on Github Codespaces.
Below are the logs:

__________________________ TestMultiFile.test_python ___________________________
self = <tests.integration.coderunners.test_multi_file.TestMultiFile object at 0x7fcff033fad0>
    def test_python(self):
>       self.run_test(SubmissionRequest(test_cases=self.test_cases, language='python', code={
            'main.py': 'from dir.code import one\n\nprint(one() + one())',
            'ones.py': 'def ret_one():\n    return 1',
            'dir': {
                'code.py': 'from ones import ret_one\n\ndef one():\n    return ret_one()'
            }
        }))
tests/integration/coderunners/test_multi_file.py:20: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
request = SubmissionRequest(code={'main.py': 'from dir.code import one\n\nprint(one() + one())', 'ones.py': 'def ret_one():\n   ...loat_precision=1e-05, delimiter=None, checker_code=None, checker_language=None, callback_url=None, encryption_key=None)
    @staticmethod
    def run_test(request: SubmissionRequest) -> SubmissionResult:
        res = CodeRunner.from_language(language=request.language).invoke(lambda_client, request=request)
        print(res)
>       assert res.overall.status == Status.OK
E       AssertionError: assert <Status.RUNTIME_ERROR: 'Runtime error'> == <Status.OK: 'Solved'>
E        +  where <Status.RUNTIME_ERROR: 'Runtime error'> = RunResult(status=<Status.RUNTIME_ERROR: 'Runtime error'>, memory=8.875, time=0.023763179779052734, return_code=1, score=0.0, message=None, outputs=None, errors=None, output_files=None, output_assets=None).status
E        +    where RunResult(status=<Status.RUNTIME_ERROR: 'Runtime error'>, memory=8.875, time=0.023763179779052734, return_code=1, score=0.0, message=None, outputs=None, errors=None, output_files=None, output_assets=None) = SubmissionResult(overall=RunResult(status=<Status.RUNTIME_ERROR: 'Runtime error'>, memory=8.875, time=0.02376317977905...9779052734, return_code=1, score=0.0, message=None, outputs=None, errors=None, output_files=None, output_assets=None)]).overall
E        +  and   <Status.OK: 'Solved'> = Status.OK
tests/integration/coderunners/test_multi_file.py:15: AssertionError
----------------------------- Captured stdout call -----------------------------
invocation result: {"overall": {"status": "Runtime error", "memory": 8.875, "time": 0.023763179779052734, "returnCode": 1, "score": 0.0, "message": null, "outputs": null, "errors": null, "outputFiles": null, "outputAssets": null}, "compileResult": {"status": "Solved", "memory": 10.0, "time": 0.0[43](https://github.com/MartinXPN/LambdaJudge/actions/runs/9114831228/job/25059711987#step:9:44)369293212890625, "returnCode": 0, "score": 0, "message": null, "outputs": "", "errors": "", "outputFiles": null, "outputAssets": null}, "lintingResult": null, "testResults": [{"status": "Runtime error", "memory": 8.875, "time": 0.023763179779052734, "returnCode": 1, "score": 0.0, "message": null, "outputs": null, "errors": null, "outputFiles": null, "outputAssets": null}]}
SubmissionResult(overall=RunResult(status=<Status.RUNTIME_ERROR: 'Runtime error'>, memory=8.875, time=0.023763179779052734, return_code=1, score=0.0, message=None, outputs=None, errors=None, output_files=None, output_assets=None), compile_result=RunResult(status=<Status.OK: 'Solved'>, memory=10.0, time=0.043369293212890625, return_code=0, score=0.0, message=None, outputs='', errors='', output_files=None, output_assets=None), linting_result=None, test_results=[RunResult(status=<Status.RUNTIME_ERROR: 'Runtime error'>, memory=8.875, time=0.0237631797790[52](https://github.com/MartinXPN/LambdaJudge/actions/runs/9114831228/job/25059711987#step:9:53)734, return_code=1, score=0.0, message=None, outputs=None, errors=None, output_files=None, output_assets=None)])
=========================== short test summary info ============================
FAILED tests/integration/coderunners/test_multi_file.py::TestMultiFile::test_python - AssertionError: assert <Status.RUNTIME_ERROR: 'Runtime error'> == <Status.OK: 'Solved'>
 +  where <Status.RUNTIME_ERROR: 'Runtime error'> = RunResult(status=<Status.RUNTIME_ERROR: 'Runtime error'>, memory=8.875, time=0.023763179779052734, return_code=1, score=0.0, message=None, outputs=None, errors=None, output_files=None, output_assets=None).status
 +    where RunResult(status=<Status.RUNTIME_ERROR: 'Runtime error'>, memory=8.875, time=0.023763179779052734, return_code=1, score=0.0, message=None, outputs=None, errors=None, output_files=None, output_assets=None) = SubmissionResult(overall=RunResult(status=<Status.RUNTIME_ERROR: 'Runtime error'>, memory=8.875, time=0.02376317977905...9779052734, return_code=1, score=0.0, message=None, outputs=None, errors=None, output_files=None, output_assets=None)]).overall
 +  and   <Status.OK: 'Solved'> = Status.OK
============= 1 failed, [56](https://github.com/MartinXPN/LambdaJudge/actions/runs/9114831228/job/25059711987#step:9:57) passed, 1 skipped in 112.07s (0:01:52) ==============
Error: Process completed with exit code 1.