chore(deps): bump github.com/rs/cors from 1.7.0 to 1.8.0 (#2334)

* chore(deps): bump github.com/rs/cors from 1.7.0 to 1.8.0

Bumps [github.com/rs/cors](https://github.com/rs/cors) from 1.7.0 to 1.8.0.
- [Release notes](https://github.com/rs/cors/releases)
- [Commits](https://github.com/rs/cors/compare/v1.7.0...v1.8.0)

---
updated-dependencies:
- dependency-name: github.com/rs/cors
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* fix test to handle 204

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Caleb Doxsey <cdoxsey@pomerium.com>

authenticate/handlers_test.go

@@ -103,7 +103,7 @@ func TestAuthenticate_Handler(t *testing.T) {
 	h.ServeHTTP(rr, req)
 	expected = fmt.Sprintf("User-agent: *\nDisallow: /")
 	code := rr.Code
-	if code != http.StatusOK {
+	if code/100 != 2 {
 		t.Errorf("bad preflight code %v", code)
 	}
 	resp := rr.Result()