fix: remove normalise_url_path_or_throw_error unnecessary lowercasing

Summary of change

This PR aims to fix the issue by removing lower method from normalise_url_path_or_throw_error function

I have tested and verified this change by adding custom thirdparty integration for Cisco Duo which has case sensitive URL for OIDC Discovery Endpoint

(If relevant, please create a PR in our docs repo, or create a checklist here highlighting the necessary changes)

[ ] Changelog has been updated
[ ] coreDriverInterfaceSupported.json file has been updated (if needed)
- Along with the associated array in supertokens_python/constants.py
[ ] frontendDriverInterfaceSupported.json file has been updated (if needed)
[ ] Changes to the version if needed
- In setup.py
- In supertokens_python/constants.py
[ ] Had installed and ran the pre-commit hook
[ ] Issue this PR against the latest non released version branch.
- To know which one it is, run find the latest released tag (git tag) in the format vX.Y.Z, and then find the latest branch (git branch --all) whose X.Y is greater than the latest released tag.
- If no such branch exists, then create one from the latest released branch.
[ ] If have added a new web framework, update the supertokens_python/utils.py file to include that in the FRAMEWORKS variable
[ ] If added a new recipe that has a User type with extra info, then be sure to change the User type in supertokens_python/types.py
[ ] Make sure that syncio / asyncio functions are consistent.
[ ] If access token structure has changed
- Modified test in tests/sessions/test_access_token_version.py to account for any new claims that are optional or omitted by the core