fix: Use newer PyPDF2 APIs

Depends on https://github.com/frappe/frappe/pull/17127
diff --git a/erpnext/regional/report/irs_1099/irs_1099.py b/erpnext/regional/report/irs_1099/irs_1099.py
index 92aeb5e..0f578be 100644
--- a/erpnext/regional/report/irs_1099/irs_1099.py
+++ b/erpnext/regional/report/irs_1099/irs_1099.py
@@ -10,7 +10,7 @@
 from frappe.utils.jinja import render_template
 from frappe.utils.pdf import get_pdf
 from frappe.utils.print_format import read_multi_pdf
-from PyPDF2 import PdfFileWriter
+from PyPDF2 import PdfWriter
 
 from erpnext.accounts.utils import get_fiscal_year
 
@@ -106,7 +106,7 @@
 
 	columns, data = execute(filters)
 	template = frappe.get_doc("Print Format", "IRS 1099 Form").html
-	output = PdfFileWriter()
+	output = PdfWriter()
 
 	for row in data:
 		row["fiscal_year"] = fiscal_year