Add the new deprecated wagtail module routes

[josueisaihs]

Updating the imports of wagtail modules that became obsolete, adding a condition that if the wagtail version is 3.0 the new import route is executed, otherwise the current one is maintained. This maintains compatibility with previous versions of wagtail.

Change wagtail.admin.edit_handlers to wagtail.admin.panels

Change wagtail.core.urls to wagtail.urls

Thank you for contributing to Salesman, before you continue make sure that:

• Tests still pass: poetry run pytest
• There are no lint errors: poetry run pre-commit run --all-files

Thank you for contributing to Salesman, before you continue make sure that:

• Tests still pass: poetry run pytest
• There are no lint errors: poetry run pre-commit run --all-files

[dinoperovic]

Hi @josueisaihs, thanks for the PR. Could you make sure the linting passes?

You can run: poetry run pre-commit run --all-files to check.

[dinoperovic]

Doplicate of #33