Merge branch 'increase-captcha-expiry-time' into 'develop'

Increase CAPTCHA expiration time to 5 minutes

Closes #1491

See merge request pleroma/pleroma!2086

config/config.exs

@@ -67,7 +67,7 @@
 
 config :pleroma, Pleroma.Captcha,
   enabled: true,
-  seconds_valid: 60,
+  seconds_valid: 3000,
   method: Pleroma.Captcha.Native
 
 config :pleroma, Pleroma.Captcha.Kocaptcha, endpoint: "https://captcha.kotobank.ch"