Improvement: Fixing deprecation warning for searchable parameter in duet

[lazyCodes7]

Description

The Course "Foundations of Private Computation" has used the searchable parameter multiple times in the initial lesson which is currently deprecated. Hence I just replaced them with pointable

Dependencies changed

• Version changed to Python 3.8.10

Tests

The repo itself doesn't really have tests but I wrote some of my own locally using unittest and everything worked.

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [ ] I have commented my code following the OpenMined Styleguide
• [x] I have labeled this PR with the relevant Type labels
• [x] My changes are covered by tests

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