It could be this change:
pyqt5 (5.15.0+dfsg-1+exp1) experimental; urgency=medium
* Switch from sip4 to sip5:
- Update build-dependencies.
- Build with sip-build instead of configure.py.
- Drop debian/patches/public_sip.diff, not needed with sip5.
- Install .sip files into the new location.
- Update runtime dependency of python3-pyqt5{,-dbg} and pyqt5-dev.
It could be this change: dfsg-1+ exp1) experimental; urgency=medium
pyqt5 (5.15.0+
* Switch from sip4 to sip5: patches/ public_ sip.diff, not needed with sip5. pyqt5{, -dbg} and pyqt5-dev.
- Update build-dependencies.
- Build with sip-build instead of configure.py.
- Drop debian/
- Install .sip files into the new location.
- Update runtime dependency of python3-