chore: update version to 3.8.5

Relates to #658

Author: YDX-2147483647

bithesis.dtx

@@ -21,10 +21,10 @@
 %<thesis>\ProvidesExplClass{bithesis}
 %<report>\ProvidesExplClass{bitreport}
 %<beamer>\ProvidesExplClass{bitbeamer}
-%<cls>  {2025-04-18} {3.8.4} {BIT Thesis Templates}
+%<cls>  {2025-05-15} {3.8.5} {BIT Thesis Templates}
 %
 %<*driver>
-\ProvidesFile{bithesis.dtx}[2025/04/18 v3.8.4 BIT Thesis Templates]
+\ProvidesFile{bithesis.dtx}[2025/05/15 v3.8.5 BIT Thesis Templates]
 \documentclass[letterpaper]{l3doc}
 \usepackage{dtx-style}