[BUG] Pypi stats badge shows invalid due to 429 rate limit exceeded

Describe the bug
Pypi stats badge on SQL-CLI README always show invalid due to 429 rate limit error. And I believe it's coming from upstream Pypistats, which is a project not well maintained.

https://github.com/crflynn/pypistats.org/issues/42

We should consider alternative: https://pepy.tech/project/opensearchsql

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Or for query issues:

1. Create the index with test documents by 'POST ...'
2. Run the query 'SELECT ...'
3. See error

Expected behavior
A clear and concise description of what you expected to happen.

Plugins
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Screenshots
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Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context
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Inizia dal README di SQL-CLI e analizza l’URL attuale del badge delle statistiche PyPI, quindi esamina la issue di Pypistats collegata e l’alternativa proposta da pepy.tech. Il lavoro è completato quando il badge del README non mostra più lo stato non valido correlato a 429 e visualizza statistiche valide del progetto.