Spyder Python 5.4.3

What's new in this version:

New features:
- Add support for QDarkstyle 3.1
- Add support for Jupyter-client 8
- Add mambaforge and miniforge when searching for conda environments

Important fixes:
- Fix IPython Console completions, traceback handling and other issues to better support IPython 8.x
- Fix compatibility issues with PyZMQ 25.x
- Add warning message before loading spydata files
- Fix web based widgets display by adding the --no-sandbox argument for QtApplication
- Fix copy and paste shortcuts for the Files and Projects explorer panes
- Fix Windows standalone installer restart mechanism
- Fix keyring backends for the Mac standalone installer
- Fix Editor issues related with handling LSP server failed starts
- Fix Editor issues related with restoring previous session and file changes outside Spyder
- Fix PYTHONPATH manager showing extra paths and other related errors
- Fix update available notification with pip based installations
- Fix some UX/UI issues for the find replace widget when the Editor has a small width
- Removal of Python 2 related code

Fixed:
- Release Spyder 5.4.3
- ModuleNotFoundError when clicking on "Connect to an existing kernel" in the Mac app
- TypeError when saving file with a different name in the editor and the LSP server failed to start
- TimeoutError and crash at startup when restoring files in the editor if OneDrive is not started
- AttributeError after closing all files in a new editor window
- Extra path shown in Pythonpath manager when using the Mac app
- Mambaforge environment not automatically detected
- Profiler process needs to remove PYTHONEXECUTABLE to run in conda env
- Crash with seaborn objects (version 0.12.2) Python 3.10 and QtConsole 5.4.0
- TypeError when trying to update environments in status bar widget
- Error when trying to add directories in PythonPath Manager
- Pane tabs in macOS are center-aligned rather than left-aligned
- Viewer of dataframes uses iteritems but shouldn't for Pandas >= 1.5.0
- Buttons in find and replace widget jump around for small editor widths
- ndarray subclasses with a member called 'dtype' crashes Spyder if dtype.name doesn't exist
- spyder-line-profiler fails silently with latest 5.x due to missing import in py3compat
- Small inconsistency in license file
- IPython console does not link to the file and row that caused the error anymore
- Error when checking for updates finishes with pip installations
- TypeError when running files in external terminal
- Pressing Tab key for code completion repeats previous text with IPython 8.8+
- Remove QDarkstyle subrepo
- Online Help Crash
- ZMQError when running code in the console
- Help pane doesn't show anything in rich text mode
- Error when running Numpy, Scipy, Pandas code with Windows installer
- Copy and paste shortcuts for Files and Projects don't work in 5.3.3
- Crash after switching git branch that removes open files
- Unable to load .spydata files containing numpy object arrays