Bump gin to fix the infinite loop and index our of range errors

[jimmykarily]

Fixes #1114

[jimmykarily]

This bump includes various fixes around routes in gin (e.g. gin-gonic/gin#2897, gin-gonic/gin#2878). With this bump we can't reproduce the problem anymore. Given how unreadable the httprouter code is, we won't invest more time in this. Hopefully this is a blind fix.

(original url that triggered the infinite loop was /api/v1/namespaces/workspace/applications/test/deployasdf)

[manno]

Some explanation on what the httprouter code does: https://github.com/julienschmidt/httprouter#how-does-it-work

These are the routes we use:

DELETE /namespaces/:namespace
DELETE /namespaces/:namespace/applications/:app
DELETE /namespaces/:namespace/applications/:app/environment/:env
DELETE /namespaces/:namespace/applications/:app/servicebindings/:service
DELETE /namespaces/:namespace/services/:service
GET    /applications
GET    /info
GET    /namespacematches
GET    /namespacematches/:pattern
GET    /namespaces
GET    /namespaces/:namespace
GET    /namespaces/:namespace/applications
GET    /namespaces/:namespace/applications/:app
GET    /namespaces/:namespace/applications/:app/environment
GET    /namespaces/:namespace/applications/:app/environment/:env
GET    /namespaces/:namespace/applications/:app/environmentmatch
GET    /namespaces/:namespace/applications/:app/environmentmatch/:pattern
GET    /namespaces/:namespace/applications/:app/logs
GET    /namespaces/:namespace/applications/:app/running
GET    /namespaces/:namespace/serviceapps
GET    /namespaces/:namespace/services
GET    /namespaces/:namespace/services/:service
GET    /namespaces/:namespace/staging/:stage_id/complete
GET    /namespaces/:namespace/staging/:stage_id/logs
GET    /services
PATCH  /namespaces/:namespace/services/:service
PATCH /namespaces/:namespace/applications/:app
POST   /namespaces
POST   /namespaces/:namespace/applications
POST   /namespaces/:namespace/applications/:app/deploy
POST   /namespaces/:namespace/applications/:app/environment
POST   /namespaces/:namespace/applications/:app/import-git
POST   /namespaces/:namespace/applications/:app/restart
POST   /namespaces/:namespace/applications/:app/servicebindings
POST   /namespaces/:namespace/applications/:app/stage
POST   /namespaces/:namespace/applications/:app/store
POST   /namespaces/:namespace/services
PUT    /namespaces/:namespace/services/:service

[juadk]

Maybe a blind fix but I don't see the issue anymore whereas I did a lot of installations last Friday and today. Thanks a lot again!