fix(deps): update module github.com/go-git/go-billy/v5 to v5.6.0

Author: renovate[bot]

go.mod

@@ -5,8 +5,8 @@ go 1.16
 require (
 	github.com/aevea/magefiles v0.0.0-20200424121010-0004d5a7a2fe
 	github.com/apex/log v1.9.0
-	github.com/go-git/go-billy/v5 v5.3.1
+	github.com/go-git/go-billy/v5 v5.6.0
 	github.com/go-git/go-git/v5 v5.4.2
 	github.com/magefile/mage v1.14.0
-	github.com/stretchr/testify v1.8.1
+	github.com/stretchr/testify v1.9.0
 )