finance/ktoblzcheck-data: Update bank data

Bank data is valid from 2026-06-08 until 2026-09-06.

Integrate my data update script into the port to keep it under version
control, easier future updates of the port, and for full transparency.

MFH: 2026Q3

(cherry picked from commit 4439524120c6e2c84d3d7394e000024624dd31a2)