Remove preamble section for old grffile packages

notebook-preamble.tex

@@ -27,18 +27,6 @@
 \usepackage{fancyvrb} % verbatim replacement that allows latex
 \usepackage{grffile} % extends the file name processing of package graphics
                     % to support a larger range
-\makeatletter % fix for old versions of grffile with XeLaTeX
-\@ifpackagelater{grffile}{2019/11/01}
-{
-% Do nothing on new versions
-}
-{
-\def\Gread@@xetex#1{%
-    \IfFileExists{"\Gin@base".bb}%
-    {\Gread@eps{\Gin@base.bb}}%
-    {\Gread@@xetex@aux#1}%
-}
-}
 \makeatother
 \usepackage[Export]{adjustbox} % Used to constrain images to a maximum size
 \adjustboxset{max size={0.9\linewidth}{0.9\paperheight}}