update update date

chapters/chap02/chap02.tex

@@ -5,7 +5,7 @@
 % Part:     theoretical background
 % Description:
 %         summary of the content in this chapter
-% Version:  25.07.2024
+% Version:  26.07.2024
 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \chapter{Theoretical background}
 \label{chap:background}