remove stale dependency

Author: chmerdon

Project.toml

@@ -14,7 +14,6 @@ ExtendableSparse = "95c220a8-a1cf-11e9-0c77-dbfce5f500b3"
 GridVisualize = "5eed8a63-0fb0-45eb-886d-8d5a387d12b8"
 IterativeSolvers = "42fd0dbc-a981-5370-80f2-aaf504508153"
 Krylov = "ba0b0d4f-ebba-5204-a429-3ac8c609bfb7"
-LaTeXStrings = "b964fa9f-0449-5b57-a5c2-d3ea65f4040f"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 LinearSolve = "7ed4a6bd-45f5-4d41-b270-4a48e9bafcae"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"