add pyqt6.6 requirements file

What is that big chain of !pyqt- etc mean? idk

ref: qutebrowser#7990

Author: toofar

misc/requirements/requirements-pyqt-6.6.txt

@@ -0,0 +1,7 @@
+# This file is automatically generated by scripts/dev/recompile_requirements.py
+
+PyQt6==6.6.0
+PyQt6-Qt6==6.6.0
+PyQt6-sip==13.6.0
+PyQt6-WebEngine==6.6.0
+PyQt6-WebEngine-Qt6==6.6.0

misc/requirements/requirements-pyqt-6.6.txt-raw

@@ -0,0 +1,4 @@
+PyQt6 >= 6.6, < 6.7
+PyQt6-Qt6 >= 6.6, < 6.7
+PyQt6-WebEngine >= 6.6, < 6.7
+PyQt6-WebEngine-Qt6 >= 6.6, < 6.7

tox.ini

@@ -51,8 +51,9 @@ deps =
     pyqt63: -r{toxinidir}/misc/requirements/requirements-pyqt-6.3.txt
     pyqt64: -r{toxinidir}/misc/requirements/requirements-pyqt-6.4.txt
     pyqt65: -r{toxinidir}/misc/requirements/requirements-pyqt-6.5.txt
+    pyqt66: -r{toxinidir}/misc/requirements/requirements-pyqt-6.6.txt
 commands =
-    !pyqt-!pyqt515-!pyqt5152-!pyqt62-!pyqt63-!pyqt64-!pyqt65: {envpython} scripts/link_pyqt.py --tox {envdir}
+    !pyqt-!pyqt515-!pyqt5152-!pyqt62-!pyqt63-!pyqt64-!pyqt65-!pyqt66: {envpython} scripts/link_pyqt.py --tox {envdir}
     {envpython} -bb -m pytest {posargs:tests}
     cov: {envpython} scripts/dev/check_coverage.py {posargs}