Ask maintainers of (major) libraries to provide hook

Now that PyInstaller allows package developers to provide hooks with their packages, we might ask developers of other (major) packages to do so.

Template for a possible text (adobt you your needs and personal style :-):

PyInstaller developer here.

PyInstaller includes a ["hook" for adapting it to the special needs and methods of XXX](https://pyinstaller.readthedocs.io/en/stable/hooks.html). This works quite well, anyway if XXX changes, it might take some time until PyInstaller catches up.

PyInstaller 4.0 (released a few weeks ago) added support for package developers to provide hooks with their packages. Thus numpy could deliver hooks including or excluding modules and files as needed. If you are interested in providing PyInstaller hooks with numpy, please have a look at [package developers to provide hooks with their packages](https://pyinstaller.readthedocs.io/en/stable/hooks.html#provide-hooks-with-package).

Start with the linked package-developer hook documentation and the proposed outreach template. Identify major Python libraries without package-provided hooks, contact their maintainers with an adapted message, and record which requests receive responses or result in hooks being provided.