Increase gunicorn workers 1 -> 6

[jawadqur]

Link to JIRA ticket if there is one:

New Features

Breaking Changes

Bug Fixes

Improvements

• Bump indexd gunicorn workers from 1 -> 6

Dependency updates

Deployment changes

[github-actions]

The style in this PR agrees with black. ✔️

This formatting comment was generated automatically by a script in uc-cdis/wool.

[george42-ctds]

Looks good.

[github-actions]

filepath	passed	skipped	SUBTOTAL
tests/test_centralized_auth.py	16	0	16
tests/test_presigned_url.py	7	0	7
tests/test_graph_submit_and_query.py	7	0	7
tests/test_data_upload.py	8	1	9
tests/test_dbgap.py	4	1	5
tests/test_audit_service.py	1	0	1
tests/test_gen3client.py	1	0	1
TOTAL	44	2	46

Please find the detailed integration test report here (login here first)