[BUG] pkgutil find_loader is deprecated in Python 3.14.

[vex87]

Thank you so much for helping improve the quality of Dash!

We do our best to catch bugs during the release process, but we rely on your help to find the ones that slip through.

Describe your context
Please provide us your environment, so we can easily reproduce the issue.

• replace the result of pip list | grep dash below

dash                    3.0.4
dash_mantine_components 1.2.0

• if frontend related, tell us your Browser, Version and OS

  • OS: win11

Describe the bug

    app.run(debug=True)
    ~~~~~~~^^^^^^^^^^^^
  File "E:\project\ElasticsearchTool\.venv\Lib\site-packages\dash\dash.py", line 2186, in run
    debug = self.enable_dev_tools(
        debug,
    ...<9 lines>...
        dev_tools_prune_errors,
    )
  File "E:\project\ElasticsearchTool\.venv\Lib\site-packages\dash\dash.py", line 1895, in enable_dev_tools
    pkgutil.find_loader(x)
    ^^^^^^^^^^^^^^^^^^^
AttributeError: module 'pkgutil' has no attribute 'find_loader'

Use importlib.util.find_spec() instead. Will be removed in Python 3.14.Pylance

Expected behavior

A clear and concise description of what you expected to happen.

Screenshots

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[vex87]

i see #3139

[vex87]

repeat