fix: Customer, Supplier heatmap data not rendering (#28553)

* fix: adding get_timeline_data import on supplier.py, customer.py
diff --git a/erpnext/buying/doctype/supplier/supplier.py b/erpnext/buying/doctype/supplier/supplier.py
index 32659d6..14d2ccd 100644
--- a/erpnext/buying/doctype/supplier/supplier.py
+++ b/erpnext/buying/doctype/supplier/supplier.py
@@ -11,7 +11,11 @@
 )
 from frappe.model.naming import set_name_by_naming_series, set_name_from_naming_options
 
-from erpnext.accounts.party import get_dashboard_info, validate_party_accounts
+from erpnext.accounts.party import (  # noqa
+	get_dashboard_info,
+	get_timeline_data,
+	validate_party_accounts,
+)
 from erpnext.utilities.transaction_base import TransactionBase
 
 
diff --git a/erpnext/selling/doctype/customer/customer.py b/erpnext/selling/doctype/customer/customer.py
index 2e2b8b7..0c8c53a 100644
--- a/erpnext/selling/doctype/customer/customer.py
+++ b/erpnext/selling/doctype/customer/customer.py
@@ -18,7 +18,11 @@
 from frappe.utils import cint, cstr, flt, get_formatted_email, today
 from frappe.utils.user import get_users_with_role
 
-from erpnext.accounts.party import get_dashboard_info, validate_party_accounts
+from erpnext.accounts.party import (  # noqa
+	get_dashboard_info,
+	get_timeline_data,
+	validate_party_accounts,
+)
 from erpnext.utilities.transaction_base import TransactionBase