Fix python instructions collecting method for python 3.9 and older

[tamarinvs19]

Description

Used dis.get_instructions() instead of __code__.co_lines() for instruction collecting if python interpreter version is older then 3.10

How to test

Manual tests

1. Run utbot on python project with python 3.9 (3.8, ...)
2. Run utbot on python project with python 3.10 (3.11, 3.12)

Self-check list

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• [ ] I've added enough comments to my code, particularly in hard-to-understand areas.
• [ ] The functionality I've repaired, changed or added is covered with automated tests.
• [x] Manual tests have been provided optionally.
• [ ] The documentation for the functionality I've been working on is up-to-date.