Bump github.com/mccutchen/go-httpbin/v2 from 2.12.0 to 2.13.4

Bumps [github.com/mccutchen/go-httpbin/v2](https://github.com/mccutchen/go-httpbin) from 2.12.0 to 2.13.4.
- [Release notes](https://github.com/mccutchen/go-httpbin/releases)
- [Commits](mccutchen/go-httpbin@v2.12.0...v2.13.4)

---
updated-dependencies:
- dependency-name: github.com/mccutchen/go-httpbin/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -9,7 +9,7 @@ require (
  github.com/getlantern/systray v1.2.2
  github.com/google/uuid v1.4.0
  github.com/martinlindhe/inputbox v0.0.0-20210326232244-b26136a79ad0
- github.com/mccutchen/go-httpbin/v2 v2.12.0
+ github.com/mccutchen/go-httpbin/v2 v2.13.4
  github.com/pkg/browser v0.0.0-20210911075715-681adbf594b8
  github.com/stretchr/testify v1.8.4
  gopkg.in/toast.v1 v1.0.0-20180812000517-0a84660828b2

go.sum

@@ -90,8 +90,8 @@ github.com/masterzen/winrm v0.0.0-20161014151040-7a535cd943fc/go.mod h1:CfZSN7zw
 github.com/masterzen/xmlpath v0.0.0-20140218185901-13f4951698ad/go.mod h1:A0zPC53iKKKcXYxr4ROjpQRQ5FgJXtelNdSmHHuq/tY=
 github.com/mattn/go-colorable v0.0.6/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
 github.com/mattn/go-isatty v0.0.0-20160806122752-66b8e73f3f5c/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
-github.com/mccutchen/go-httpbin/v2 v2.12.0 h1:MPrFw/Avug0E83SN/j5SYDuD9By0GDAJ9hNTR4RwjyU=
-github.com/mccutchen/go-httpbin/v2 v2.12.0/go.mod h1:f4DUXYlU6yH0V81O4lJIwqpmYdTXXmYwzxMnYEimFPk=
+github.com/mccutchen/go-httpbin/v2 v2.13.4 h1:KjUeehEAcWG+ce5WJVtP3cyquL0Qe/jQ4UWe/N1BVDw=
+github.com/mccutchen/go-httpbin/v2 v2.13.4/go.mod h1:f4DUXYlU6yH0V81O4lJIwqpmYdTXXmYwzxMnYEimFPk=
 github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d h1:VhgPp6v9qf9Agr/56bj7Y/xa04UccTW04VP0Qed4vnQ=
 github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d/go.mod h1:YUTz3bUH2ZwIWBy3CJBeOBEugqcmXREj14T+iG/4k4U=
 github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c h1:rp5dCmg/yLR3mgFuSOe4oEnDDmGLROTvMragMUXpTQw=