Update vulnerable packages (Flagsmith#1943)

* Update vulnerable packages

* Update cryptography (and parent packages where necessary)

* Upgrade packages to fix conflicts between dev / main requirements

* Use requirements-all.txt

* Drop support for py3.7

* black formatting

Remove flagsmith dev env (Flagsmith#1907)

Fix duplicate segment condition audit messages (Flagsmith#1925)

* Handle segment rules / conditions updates properly

* Add test

* Add logic to delete segment rules / conditions

Prevent unauthorized creation of master API key (Flagsmith#1868)

* Prevent unauthenticated creation of master API key

* Don't return revoked keys

Input validation (Flagsmith#1820)

Refactor projectOverrides (Flagsmith#1807)

* Refactor projectOverrides

Fix is_feature_name_valid for Oracle DB support (Flagsmith#1798)

Prevent auto seat upgrade code from running unless configured (Flagsm…

…ith#1786)

* Prevent auto seat upgrade code from running unless configured

* Fix tests

Remove MANAGE_USERS permission (Flagsmith#1771)

Features/tag environment (Flagsmith#1759)

* Tag environment