Fix DeprecationWarning: Replace 'source deactivate' with 'conda deactivate

[Dasux]

Issue:
in the /backend/script.sh file.. there is a line of code source deactivate
this is deprecated and no longer used..

Solution:

replace it with conda deactivate to close virtual environment

[Dasux]

Update:

i made a mistake in assessing the issue earlier
we are using python's venv to create a virtual env... and so we cant mix venv with conda

this was causing the issue..

Fix:
just use the normal deactivate instead of conda deactivate