Description of problem:
When starting eric, the spash screen is shown for a moment, then nothing.
When started from the command line, the following log is printed:

$ eric6
QSocketNotifier: Can only be used with threads started with QThread
BackgroundService listening on: 44543
An unhandled exception occurred. Please report the problem
using the error reporting dialog or via email to <eric-bugs.org>.
A log has been written to "/home/otto/.eric6/eric6_error.log".

Error information:
--------------------------------------------------------------------------------
2023-03-13, 21:23:15
--------------------------------------------------------------------------------
<class 'TypeError'>: 
setPixelSize(self, int): argument 1 has unexpected type 'float'
--------------------------------------------------------------------------------
  File "/usr/lib/python3.11/site-packages/eric6/eric6.py", line 415, in <module>
    main()
  File "/usr/lib/python3.11/site-packages/eric6/eric6.py", line 394, in main
    mainWindow = UserInterface(app, loc, splash, pluginFile, disabledPlugins,
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/eric6/UI/UserInterface.py", line 293, in __init__
    self.__createLayout(debugServer)
  File "/usr/lib/python3.11/site-packages/eric6/UI/UserInterface.py", line 791, in __createLayout
    self.__createSidebarsLayout(debugServer)
  File "/usr/lib/python3.11/site-packages/eric6/UI/UserInterface.py", line 1080, in __createSidebarsLayout
    self.pipWidget = PipPackagesWidget(self.pipInterface)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/eric6/PipInterface/PipPackagesWidget.py", line 59, in __init__
    self.setupUi(self)
  File "/usr/lib/python3.11/site-packages/eric6/PipInterface/Ui_PipPackagesWidget.py", line 30, in setupUi
    self.pipMenuButton = E5ToolButton(self.baseWidget)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/eric6/E5Gui/E5ToolButton.py", line 56, in __init__
    font.setPixelSize(self.__badgeLabel.height() / 2.5)

--------------------------------------------------------------------------------
Version Numbers:
  Python 3.11.2, 64-Bit
  Qt 5.15.8
  PyQt 5.15.6
  PyQtChart 5.15.5  PyQtWebEngine 5.15.4  QScintilla 2.13.0
  sip 6.6.2
  WebEngine 87.0.4280.144
  eric6 20.1 (rev. 7fe343f85860)

Platform: linux
3.11.2 (main, Feb  8 2023, 00:00:00) [GCC 12.2.1 20221121 (Red Hat 12.2.1-4)]

Desktop: GNOME
--------------------------------------------------------------------------------
Distribution Info:
  (snip)

QProcess: Destroyed while process ("/usr/bin/python3") is still running.
An unhandled exception occurred. Please report the problem
using the error reporting dialog or via email to <eric-bugs.org>.
A log has been written to "/home/otto/.eric6/eric6_error.log".

Error information:
--------------------------------------------------------------------------------
2023-03-13, 21:23:15
--------------------------------------------------------------------------------
<class 'RuntimeError'>: 
wrapped C/C++ object of type BackgroundService has been deleted
--------------------------------------------------------------------------------
  File "/usr/lib/python3.11/site-packages/eric6/Utilities/BackgroundService.py", line 396, in <lambda>
    lambda x=lang: self.on_disconnectSocket(x))
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/eric6/Utilities/BackgroundService.py", line 431, in on_disconnectSocket
    self.tr('Background client disconnected.'),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

--------------------------------------------------------------------------------
Version Numbers:
  (snip)

Platform: linux
3.11.2 (main, Feb  8 2023, 00:00:00) [GCC 12.2.1 20221121 (Red Hat 12.2.1-4)]

Desktop: GNOME
--------------------------------------------------------------------------------
Distribution Info:
  (snip)

Version-Release number of selected component (if applicable):
20.1-11.fc37

How reproducible:
Always

Steps to Reproduce:
1. Run 'eric'

Actual results:
Error as given in the issue description.

Expected results:
It starts.


Additional info:
Looks like this package is lagging a couple of years of updates.
Upstream is at version 23.03.