build: Pin frappe requirements to ^16.0.0 (#39782)

erpnext/setup/install.py

@@ -2,14 +2,12 @@
 # License: GNU General Public License v3. See license.txt
 
 
-import click
 import frappe
 from frappe import _
 from frappe.custom.doctype.custom_field.custom_field import create_custom_fields
 from frappe.desk.page.setup_wizard.setup_wizard import add_all_roles_to
 from frappe.utils import cint
 
-import erpnext
 from erpnext.setup.default_energy_point_rules import get_default_energy_point_rules
 from erpnext.setup.doctype.incoterm.incoterm import create_incoterms
 
@@ -42,25 +40,6 @@ You can reinstall this site (after saving your data) using: bench --site [sitena
 		frappe.throw(message)  # nosemgrep
 
 
-def check_frappe_version():
-	def major_version(v: str) -> str:
-		return v.split(".")[0]
-
-	frappe_version = major_version(frappe.__version__)
-	erpnext_version = major_version(erpnext.__version__)
-
-	if frappe_version == erpnext_version:
-		return
-
-	click.secho(
-		f"You're attempting to install ERPNext version {erpnext_version} with Frappe version {frappe_version}. "
-		"This is not supported and will result in broken install. Switch to correct branch before installing.",
-		fg="red",
-	)
-
-	raise SystemExit(1)
-
-
 def set_single_defaults():
 	for dt in (
 		"Accounts Settings",