add pytest to requirements.txt

[mailler0xa]

Description

When running lithops test, lack of pytest caused it to fail.

Error

Traceback (most recent call last):
File "/home/user/Documents/ShadowClone/env/bin/lithops", line 8, in
sys.exit(lithops_cli())
File "/home/user/Documents/ShadowClone/env/lib/python3.10/site-packages/click/core.py", line 1157, in call
return self.main(*args, **kwargs)
File "/home/user/Documents/ShadowClone/env/lib/python3.10/site-packages/click/core.py", line 1078, in main
rv = self.invoke(ctx)
File "/home/user/Documents/ShadowClone/env/lib/python3.10/site-packages/click/core.py", line 1688, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/user/Documents/ShadowClone/env/lib/python3.10/site-packages/click/core.py", line 1434, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/user/Documents/ShadowClone/env/lib/python3.10/site-packages/click/core.py", line 783, in invoke
return __callback(*args, **kwargs)
File "/home/user/Documents/ShadowClone/env/lib/python3.10/site-packages/lithops/scripts/cli.py", line 156, in test
import pytest
ModuleNotFoundError: No module named 'pytest'

Ubuntu version tested on:

PRETTY_NAME="Ubuntu 22.04.5 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.5 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

Reproducing

Run the commands here on a fresh OS: https://github.com/fyoorer/ShadowClone/wiki#local-machine

Fix:

Add pytest to requirements.txt or manually run pip install pytest on the directory before running lithops test.

[m0pam]

Bump.
@fyoorer all it takes to fix this is adding pytest to the requirements.txt file (possibly with a pinned version).

[Sh4d0wHunt3rX]

Reported here as well #63