Update CI python versions (#31)

* test 3.9 -> 3.13
* update classifiers
* version bump
* update deps
* update pytest deps
* working httpx + mock

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Co-authored-by: sourcery-ai[bot] <58596630+sourcery-ai[bot]@users.noreply.github.com>

Author: Kilo59

.github/workflows/ci.yaml

@@ -65,7 +65,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.7, 3.8, 3.9, '3.10']
+        python-version: [3.9, '3.10', '3.11', '3.12']
 
     runs-on: ${{ matrix.os }}