feat: update FIA document URL for 2026 season (#281)

Author: gildesmarais

lib/html2rss/configs/fia.com/documents.yml

@@ -1,6 +1,6 @@
 ---
 channel:
-  url: https://www.fia.com/documents/championships/fia-formula-one-world-championship-14/season/season-2025-2071
+  url: https://www.fia.com/documents/championships/fia-formula-one-world-championship-14/season/season-2026-2072
   ttl: 360
   time_zone: UTC
 selectors: