Update module github.com/mailgun/mailgun-go/v4 to v4.15.2 (#11)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

go.mod

@@ -3,7 +3,7 @@ module github.com/theopenlane/newman
 go 1.23.0
 
 require (
-	github.com/mailgun/mailgun-go/v4 v4.15.1
+	github.com/mailgun/mailgun-go/v4 v4.15.2
 	github.com/microcosm-cc/bluemonday v1.0.27
 	github.com/resend/resend-go/v2 v2.12.0
 	github.com/sendgrid/rest v2.6.9+incompatible

go.sum

@@ -74,8 +74,8 @@ github.com/gorilla/css v1.0.1/go.mod h1:BvnYkspnSzMmwRK+b8/xgNPLiIuNZr6vbZBTPQ2A
 github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
 github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
-github.com/mailgun/mailgun-go/v4 v4.15.1 h1:/xL/JBF/SWd3m9iscO1wKpv9tzcK21eRRJAqIlyk3EQ=
-github.com/mailgun/mailgun-go/v4 v4.15.1/go.mod h1:L9s941Lgk7iB3TgywTPz074pK2Ekkg4kgbnAaAyJ2z8=
+github.com/mailgun/mailgun-go/v4 v4.15.2 h1:8u/mjr0ElBtAVRkMGLnFbGa7yNN1OJ13/K4/Tmmb5a4=
+github.com/mailgun/mailgun-go/v4 v4.15.2/go.mod h1:L9s941Lgk7iB3TgywTPz074pK2Ekkg4kgbnAaAyJ2z8=
 github.com/microcosm-cc/bluemonday v1.0.27 h1:MpEUotklkwCSLeH+Qdx1VJgNqLlpY2KXwXFM08ygZfk=
 github.com/microcosm-cc/bluemonday v1.0.27/go.mod h1:jFi9vgW+H7c3V0lb6nR74Ib/DIB5OBs92Dimizgw2cA=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=