See how Boundary would look with gofumpt applied (#853)

* See how Boundary would look with https://github.com/mvdan/gofumpt applied

Results of running `gofumpt -w -s .`

* Update tools file and Makefile for gofumpt

Co-authored-by: Jeff Mitchell <jeffrey.mitchell@gmail.com>

internal/session/testing_test.go

@@ -76,6 +76,7 @@ func Test_TestWorker(t *testing.T) {
 	w := TestWorker(t, conn, wrapper)
 	require.NotNil(w)
 }
+
 func Test_TestCert(t *testing.T) {
 	t.Helper()
 	assert, require := assert.New(t), require.New(t)