Fix issues with loading data on python 3.9

[maclandrol]

Changelogs

• Fix errors due to importlib.resources not being able to parse data from medchem.data on py<3.10

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Checklist:

• Was this PR discussed in an issue? It is recommended to first discuss a new feature into a GitHub issue before opening a PR.
• Add tests to cover the fixed bug(s) or the new introduced feature(s) (if appropriate).
• Update the API documentation is a new function is added, or an existing one is deleted.
• Write concise and explanatory changelogs above.
• If possible, assign one of the following labels to the PR: feature, fix or test (or ask a maintainer to do it for you).

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Discussion related to this PR can be found in #19 . This PR effectively fixes #19