Fix tests failing on conda

[noexec]

Since Dec 8, 2023, conda tests in CI/CD fail at least for Ubuntu with Python 3.8 and 3.11.
Seems unrelated to PycURL package version, which is 7.45.1 before and after the tests started failing.

[noexec]

The issue is with partial download failing because HTTP 416 does not result in pycurl.error exception, only on conda. The test is disabled in commit 54eec40.

[noexec]

Looks like test failures depend on the specific pycurl/libcurl builds used.

Failing images:

• all windows
• all miniconda
• ubuntu-24.04 platform

Success:

• all ubuntu venv
• ubuntu-22.04 platform

Same 12 iterations fail:

• verify_file=True
• size=51, part_size=51 → Failed: DID NOT RAISE <class 'pycurl.error'>
• size=150, part_size=200 → ValueError: Size mismatch for …file.bin.part: 200 instead of 150 B