sage: add nbclassic dependency

+3
+3
pkgs/applications/science/math/sage/sagelib.nix
··· 78 78 , sphinx 79 79 , sympy 80 80 , typing-extensions 81 + , nbclassic 81 82 }: 82 83 83 84 assert (!blas.isILP64) && (!lapack.isILP64); ··· 181 182 sphinx 182 183 sympy 183 184 typing-extensions 185 + 186 + nbclassic 184 187 ]; 185 188 186 189 preBuild = ''