Remove unused QuadGK dep

Author: mikeingold

test/Project.toml

@@ -4,7 +4,6 @@ CoordRefSystems = "b46f11dc-f210-4604-bfba-323c1ec968cb"
 ExplicitImports = "7d51a73a-1435-4ff3-83d9-f097790105c7"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Meshes = "eacbb407-ea5a-433e-ab97-5258b1ca43fa"
-QuadGK = "1fd47b50-473d-5c70-9696-f719f8f3bcdc"
 SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 TestItemRunner = "f8b46487-2199-4994-9208-9a1283c18c0a"
@@ -17,7 +16,6 @@ CoordRefSystems = "0.12, 0.13, 0.14, 0.15, 0.16"
 ExplicitImports = "1.6.0"
 LinearAlgebra = "1"
 Meshes = "0.50, 0.51, 0.52"
-QuadGK = "2.1.1"
 SpecialFunctions = "2"
 TestItemRunner = "1"
 TestItems = "1"