chore: Add LCJ for their contribution to the C code

DESCRIPTION

@@ -9,6 +9,7 @@ Authors@R: c(
            comment = c(ORCID = "0000-0003-4060-2754")),
     person("Silke", "Szymczak", role = "aut",
            comment = c(ORCID = "0000-0002-8897-9035")),
+    person("Lukas C.", "Jarren", role = "ctb"),
     person("Florian", "Gärber", , "florian.gaerber@uni-hamburg.de", role = "ctb",
            comment = c(ORCID = "0000-0003-3875-9736"))
   )