Wrongly capitalizes module name: "Requests"

here's my command:
```
>>> pipreqs . --force --encoding=utf-8 --mode no-pin --debug
DEBUG: Found packages: {'time', 'subprocess', 'urllib', 'sys', 'typing', 'requests', 'logging', 'os', 'base64', 'traceback', 'webbrowser', 'linecache', 'json', 'csv', 'tqdm', 'socketserver', 'datetime', 'concurrent', 'collections', 'math', 'http', 'glob', 'cProfile', 'pstats'}
DEBUG: Found imports: Requests, tqdm
DEBUG: Getting packages information from Local/PyPI
WARNING: Import named "Requests" not found locally. Trying to resolve it at the PyPI server.
DEBUG: Starting new HTTPS connection (1): pypi.python.org:443
DEBUG: https://pypi.python.org:443 "GET /pypi/Requests/json HTTP/11" 301 122
DEBUG: Starting new HTTPS connection (1): pypi.org:443
DEBUG: https://pypi.org:443 "GET /pypi/requests/json HTTP/11" 200 37837
WARNING: Import named "Requests" was resolved to "requests:2.32.5" package (https://pypi.org/project/requests/).
Please, verify manually the final list of requirements.txt to avoid possible dependency confusions.
DEBUG: Writing 2 requirements: Requests, tqdm to .\requirements.txt
INFO: Successfully saved requirements file in .\requirements.txt
```

it for some reason tries to resolve "Requests" with a capital, not "requests"
I checked my code, i used "Requests" nowhere, only the standart `import requests.`
Even after nuking "requirements.txt" and trying again (with pretty much any set of arguments) is does the same.

### environment
- windows 11 (thats why the --encoding is needed)
- requests module is ofc installed locally, but it searches Requests
- pipreqs version 0.4.13
- trying on this repo: [https://github.com/Michal-Martinek/PriceScraper](https://github.com/Michal-Martinek/PriceScraper)

Reproduce the reported pipreqs command against the linked PriceScraper repository and trace how discovered import names are matched to local or PyPI packages. The payload names no files or tests; done means the standard lowercase `requests` import is resolved and written correctly without regressions.

Written by the indexing model from the issue text.