fix linter findings

Author: chombium

src/trafficcontroller/internal/proxy/doppler_proxy_test.go

@@ -100,7 +100,7 @@ var _ = Describe("DopplerProxy", func() {
 			dopplerProxy.ServeHTTP(recorder, req)
 
 			Expect(recorder.Code).To(Equal(http.StatusOK))
-			Expect(recorder.Header().Get("Set-Cookie")).To(Equal("cookie=monster; Domain=cookieDomain; HttpOnly; Secure"))
+			Expect(recorder.Header().Get("Set-Cookie")).To(Equal("cookie=monster; Domain=cookieDomain; HttpOnly; Secure; SameSite=Lax"))
 		})
 
 		It("returns a bad request if the form does not parse", func() {

src/trafficcontroller/internal/proxy/set_cookie_handler.go

@@ -30,5 +30,6 @@ func (h SetCookieHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		Domain:   h.domain,
 		Secure:   true,
 		HttpOnly: true,
+		SameSite: http.SameSiteLaxMode,
 	})
 }