feat(backend)!: bump to dj 5.2 lts / py 3.11 (#10730)

* feat(backend): bump to 5.2 lts / python 3.11

This will give us support till 2027-10 (PEP 664)

* bump dependencies

* fix dflt version

* remove 3.9 precaution

* changes for 5.2

* changes for py 3.10

* debug command

* lower crypto again

* another lowering

* fix version string

* lower minimum version to 3.11

* update refs

* fix text

* reaking: remove now unsupported OS

* disable break

* remove temp changes

* fix ruff call

* fix remaining ruff warnings

* remove old arg

* lower allauth reqs

* replace old method

* fix issue with args passing beeing depreceated

* add changelog entries

* bump dependencies a bit further

* fix broken image init for now
might need a refactor

* fix another test

* refactor image name lookup

* mroe refactoring

* ensure str does not cause an issue

* update referenced function

* fix cal sig

* simplify method and add test

* refactor

* ignore wrong typings

* fix deprecated feature

* simplify

* ensure image tests do their job

* simplify

* re-add type check

* fix test

* fix assertations - wonder how long this was broken

* bump to newer versions

* bump deps

* fix assertation

.pkgr.yml

@@ -20,9 +20,9 @@ before:
   - contrib/packager.io/before.sh
 dependencies:
   - curl
-  - "python3.9 | python3.10 | python3.11 | python3.12 | python3.13 | python3.14"
-  - "python3.9-venv | python3.10-venv | python3.11-venv | python3.12-venv | python3.13-venv | python3.14-venv"
-  - "python3.9-dev | python3.10-dev | python3.11-dev | python3.12-dev | python3.13-dev | python3.14-dev"
+  - "python3.11 | python3.12 | python3.13 | python3.14"
+  - "python3.11-venv | python3.12-venv | python3.13-venv | python3.14-venv"
+  - "python3.11-dev | python3.12-dev | python3.13-dev | python3.14-dev"
   - python3-pip
   - python3-cffi
   - python3-brotli
@@ -35,8 +35,6 @@ dependencies:
   - jq
   - "libffi7 | libffi8"
 targets:
-  ubuntu-20.04: true
   ubuntu-22.04: true
   ubuntu-24.04: true
-  debian-11: true
   debian-12: true