!feat(backend): bump minimum python version (#12223)

* bump ci versions

* bump installer version

* bump tooling version ref

* bump doc refs

* bump / refactor code refs

* bump debug ref

* remove now unneeded deps

* bump release version

* remove distutils

* fix finder call

* remove old compat code

* add changelog entry

* lower cov target for now

codecov.yml

@@ -24,7 +24,7 @@ flag_management:
       carryforward: true
       statuses:
         - type: project
-          target: 40%
+          target: 38%
     - name: web
       carryforward: true
       statuses: