Don't check for Project.toml formatting on v1.6 (#384)

Author: jishnub

test/runtests.jl

@@ -5,7 +5,10 @@ using Test
 
 using Aqua
 @testset "Project quality" begin
-    Aqua.test_all(BandedMatrices, ambiguities=false, piracy=false)
+    Aqua.test_all(BandedMatrices, ambiguities=false, piracy=false,
+        # only test formatting on VERSION >= v1.7
+        # https://github.com/JuliaTesting/Aqua.jl/issues/105#issuecomment-1551405866
+        project_toml_formatting = VERSION >= v"1.7")
 end
 
 using Documenter