fix: Fixed a wrong link to supported python versions in `contributing.md` file

[Sai-Suraj-27]

What does this PR do?

Fixes a wrong link to supported Python versions in contributing.md file.

Before submitting

• [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [ ] Did you read the contributor guideline?
• [ ] Did you read our philosophy doc (important for complex PRs)?
• [ ] Was this discussed/approved via a GitHub issue or the forum? Please add a link to it if that's the case.
• [ ] Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
• [ ] Did you write any new necessary tests?

Who can review?

Core library:

• General functionalities: @sayakpaul