Bootstrap forms version in upgrade documentation does not match requirements.

[mattbuff]

Describe the bug
The upgrade documentation mentions django-bootstrap5, but the installation documentation and requirements mention django-bootstrap4.

django-helpdesk/docs/upgrade.rst

Lines 14 to 17 in f379bbe

	0.3 -> 0.4
	----------
	- Under `INSTALLED_APPS`, `bootstrap4form` needs to be replaced with `bootstrap5form`

django-helpdesk/docs/install.rst

Line 68 in f379bbe

'bootstrap4form', # Required for nicer formatting of forms with the default templates

django-helpdesk/requirements.txt

Line 2 in f379bbe

django-bootstrap4-form

django-helpdesk/requirements-no-pinax.txt

Line 2 in f379bbe

django-bootstrap4-form