Ensure package_urls end with a slash

In PyPI simple repository format, package URLs typically end with the
package name and should have a trailing slash [1].
To ensure this trailing slash, the some web servers might redirect to
the URL with the trailing slash.
This causes the issue that the BasicAuth credentials are removed from
the request for security reasons.

This was observed with an internal Artifactory repository and adding a
trailing slash to the package_url fixes the issue.

[1]: https://peps.python.org/pep-0503/#specification

Resolves: #127.

Signed-off-by: Marcel Bochtler <marcel.bochtler@bosch.com>

Author: MarcelBochtler

src/python_inspector/utils_pypi.py

@@ -1598,6 +1598,10 @@ async def fetch_links(
         name using the `index_url` of this repository.
         """
         package_url = f"{self.index_url}/{normalized_name}"
+
+        if not package_url.endswith("/"):
+            package_url += "/"
+
         text, _ = await CACHE.get(
             path_or_url=package_url,
             credentials=self.credentials,