New issue by zlice on void-packages repository

https://github.com/void-linux/void-packages/issues/33897

Description:
<!-- Don't request update of package. We have a script for that. https://alpha.de.repo.voidlinux.org/void-updates/void-updates.txt . However, a quality pull request may help. -->
### System

* xuname:  `Void 5.14.3 x86_64 AuthenticAMD notuptodate hold rrrmFFFFFFFFF`
* package: `openshot-2.5.1_3`


### Expected behavior

Get to GUI

### Actual behavior

openshot hangs

### Steps to reproduce the behavior

```
openshot-qt 
Loaded modules from installed directory: /usr/lib/python3.10/site-packages/openshot_qt

         app:INFO ------------------------------------------------
         app:INFO             Thu Nov  4 07:38:06 2021            
         app:INFO               Starting new session              
         app:INFO ------------------------------------------------
         app:INFO             OpenShot (version 2.5.1)            
         app:INFO ------------------------------------------------
         app:INFO openshot-qt version: 2.5.1
         app:INFO libopenshot version: 0.2.5
         app:INFO platform: Linux-5.14.3-x86_64-with-glibc2.32
         app:INFO processor: 
         app:INFO machine: x86_64
         app:INFO python version: 3.10.0
         app:INFO qt5 version: 5.15.2
         app:INFO pyqt5 version: 5.15.5
     metrics:ERROR Error determining OS version in metrics.py
    language:INFO Qt Detected Languages: ['en-US']
    language:INFO LANG Environment Variable: en_US.UTF-8
    language:INFO LOCALE Environment Variable: 
    language:INFO OpenShot Preference Language: Default
project_data:INFO Setting default profile to HD 720p 30 fps
         app:INFO Setting font to /usr/lib/python3.10/site-packages/openshot_qt/images/fonts/Ubuntu-R.ttf
logger_libopenshot:INFO Connecting to libopenshot with debug port: 5556
         app:INFO Setting custom dark theme
QMainWindow::addDockWidget: invalid 'area' argument
     ui_util:INFO Initializing UI for MainWindow
  exceptions:ERROR Unhandled Exception
Traceback (most recent call last):
  File "/bin/openshot-qt", line 33, in <module>
    sys.exit(load_entry_point('openshot-qt==2.5.1', 'gui_scripts', 'openshot-qt')())
  File "/usr/lib/python3.10/site-packages/openshot_qt/launch.py", line 97, in main
    app = OpenShotApp(argv)
  File "/usr/lib/python3.10/site-packages/openshot_qt/classes/app.py", line 221, in __init__
    self.window = MainWindow(mode)
  File "/usr/lib/python3.10/site-packages/openshot_qt/windows/main_window.py", line 2521, in __init__
    self.timeline = TimelineWebView(self)
  File "/usr/lib/python3.10/site-packages/openshot_qt/windows/views/timeline_webview.py", line 3000, in __init__
    self.cache_renderer.setInterval(0.5 * 1000)
TypeError: setInterval(self, int): argument 1 has unexpected type 'float'
     version:INFO Found current version: {"openshot_version": "2.6.1", "error_rate_stable": 0.05, "error_rate_unstable": 0.05}

^C      logger:ERROR Exception ignored in:
      logger:ERROR <module 'threading' from '/usr/lib/python3.10/threading.py'>
      logger:ERROR Traceback (most recent call last):
      logger:ERROR   File "/usr/lib/python3.10/threading.py", line 1538, in _shutdown
      logger:ERROR lock.acquire()
      logger:ERROR KeyboardInterrupt
      logger:ERROR :
         app:INFO             OpenShot's session ended            
         app:INFO             Thu Nov  4 07:39:43 2021            
         app:INFO ================================================



```