CI with pytest always runs with pinned Python versions

[redeboer]

The .github/workflows/pytest.yml always runs pytest with the version specified in .python-version (if committed). The fix would be to specify --python=3.x, --python-preference=only-system, and optionally --no-python-downloads.

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1. FIX: fix is_integer() bug for QRules v0.10.4 ampform#450
   🐛 Bug 🔨 Maintenance 🖱️ DX +3
   
2. MAINT: update lock files ampform-dpd#151
   🔨 Maintenance 🖱️ DX +2
   
3. MAINT: update lock files polarimetry#373
   🔨 Maintenance 🖱️ DX +2
   
4. FIX: avoid Python 3.10 syntax policy#492
   🐛 Bug +1
   
5. MAINT: update lock files PWA-pages#231
   🔨 Maintenance 🖱️ DX +2
   
6. FIX: support Python 3.9 again qrules#316
   🐛 Bug +1
   
7. MAINT: update lock files sphinx-hep-pdgref#45
   🔨 Maintenance 🖱️ DX +2
   
8. MAINT: update lock files tensorwaves#539
   🔨 Maintenance 🖱️ DX +2
   
9. MAINT: update lock files RUB-EP1/pawian-tools#58
   🔨 Maintenance 🖱️ DX +2
   

[redeboer]

Note that UV_SYSTEM_PYTHON was set, but not for every step.