Fix ICES pipeline - add algorithm sty

Using Docker executor with image registry.hzdr.de/mussel/netlogo-northsea-species/pandoc:latest ...
$ make -C doc/ices pdf
Error producing PDF.
! LaTeX Error: File `algorithm.sty' not found.
Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)
Enter file name: 
! Emergency stop.
<read *> 
         
l.27 \usepackage
make: *** [Makefile:62: Lemmen2024_etal_icesjmarinescience.pdf] Error 43
make: Leaving directory '/builds/mussel/netlogo-northsea-species/doc/ices'