When importing reportlab from python 3.10, a deprecation warning is
emitted from the standard library importlib module.  This warnings
occurs because of the usage of the `load_module()` method used in
reportlab. This deprecated usage is not yet fixed in the current
reportlab version 3.6.11.

This makes it difficult to filter out with the `filterwarnings` method
because it would then catch any other usage of `load_module` from
anywhere.

With this commit, this deprecation is caught and ignored at the import
time.

Note: this issue did not appear in 15.0 because `reportlab` is imported
in the `odoo.tools` module which is loaded before activation of the
deprecation warnings.

Part-of: odoo/odoo#98081