chore: use PyQt5 for minimum instead of PyQt6

The CI for `311-minimum_versions` tests the clipboard with `PyQt5`.

Author: Alvaro-Kothe

ci/deps/actions-311-minimum_versions.yaml

@@ -62,5 +62,4 @@ dependencies:
   - zstandard=0.23.0
 
   - pip:
-    - PyQt6==6.7.1
     - tzdata==2023.3

pandas/compat/_optional.py

@@ -55,7 +55,7 @@
     "xlsxwriter": "3.2.0",
     "zstandard": "0.23.0",
     "qtpy": "2.4.2",
-    "pyqt6": "6.7.1",
+    "pyqt5": "5.15.9",
 }
 
 # A mapping from import name to package name (on PyPI) for packages where

pyproject.toml

@@ -76,7 +76,7 @@ html = ['beautifulsoup4>=4.12.3', 'html5lib>=1.1', 'lxml>=5.3.0']
 xml = ['lxml>=5.3.0']
 plot = ['matplotlib>=3.9.3']
 output-formatting = ['jinja2>=3.1.5', 'tabulate>=0.9.0']
-clipboard = ['PyQt6>=6.7.1', 'qtpy>=2.4.2']
+clipboard = ['PyQt5>=5.15.9', 'qtpy>=2.4.2']
 compression = ['zstandard>=0.23.0']
 timezone = ['pytz>=2024.2']
 all = ['adbc-driver-postgresql>=1.2.0',
@@ -99,7 +99,7 @@ all = ['adbc-driver-postgresql>=1.2.0',
        'pyarrow>=13.0.0',
        'pyiceberg>=0.8.1',
        'pymysql>=1.1.1',
-       'PyQt6>=6.7.1',
+       'PyQt5>=5.15.9',
        'pyreadstat>=1.2.8',
        'pytest>=7.3.2',
        'pytest-xdist>=3.4.0',

scripts/tests/data/deps_minimum.toml

@@ -71,7 +71,7 @@ html = ['beautifulsoup4>=4.9.3', 'html5lib>=1.1', 'lxml>=4.6.3']
 xml = ['lxml>=4.6.3']
 plot = ['matplotlib>=3.6.1']
 output_formatting = ['jinja2>=3.0.0', 'tabulate>=0.8.9']
-clipboard = ['PyQt6>=6.7.1', 'qtpy>=2.3.0']
+clipboard = ['PyQt5>=5.15.1', 'qtpy>=2.3.0']
 compression = ['zstandard>=0.15.2']
 all = ['beautifulsoup4>=5.9.3',
        'bottleneck>=1.3.2',
@@ -91,7 +91,6 @@ all = ['beautifulsoup4>=5.9.3',
        'pyarrow>=7.0.0',
        'pymysql>=1.1.0',
        'PyQt5>=5.15.1',
-       'PyQt6>=6.7.1',
        'pyreadstat>=1.1.2',
        'pytest>=7.3.2',
        'pytest-xdist>=3.4.0',