CompatHelper: bump compat for Gridap to 0.18, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -12,7 +12,7 @@ PDENLPModels = "80da258d-c172-4540-9646-64f172512520"
 [compat]
 ChainRulesCore = "1"
 DataFrames = "1"
-Gridap = "0.15.5"
+Gridap = "0.15.5, 0.18"
 PDENLPModels = "^0.3.2"
 julia = "^1.3.0"