Python 3.9 upgrade

[MaribelleHGomez]

Jira Ticket: PXP-xxxx

• Remove this line if you've changed the title to (PXP-xxxx): <title>

New Features

Breaking Changes

• Removed 'safe_str_cmp' from 'werkzeug.security' in v2.1.0

Bug Fixes

Improvements

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.

[coveralls]

Pull Request Test Coverage Report for Build 12748

• 36 of 39 (92.31%) changed or added relevant lines in 19 files are covered.
• 129 unchanged lines in 12 files lost coverage.
• Overall coverage decreased (-0.8%) to 73.096%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
fence/dbSession.py	10	11	90.91%
fence/jwt/validate.py	1	3	33.33%

Files with Coverage Reduction	New Missed Lines	%
fence/auth.py	1	88.74%
fence/blueprints/login/ras.py	1	78.43%
fence/blueprints/login/shib.py	1	91.11%
fence/utils.py	1	60.0%
fence/resources/ga4gh/passports.py	2	87.43%
fence/blueprints/oauth2.py	3	75.54%
fence/jwt/validate.py	3	60.0%
fence/blueprints/storage_creds/google.py	4	66.67%
fence/jwt/blacklist.py	9	73.91%
fence/sync/passport_sync/ras_sync.py	23	24.32%

Totals
Change from base Build 12686:	-0.8%
Covered Lines:	6909
Relevant Lines:	9452

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💛 - Coveralls