Bump github.com/gin-gonic/gin from 1.4.0 to 1.9.1

Bumps [github.com/gin-gonic/gin](https://github.com/gin-gonic/gin) from 1.4.0 to 1.9.1.
- [Release notes](https://github.com/gin-gonic/gin/releases)
- [Changelog](https://github.com/gin-gonic/gin/blob/master/CHANGELOG.md)
- [Commits](gin-gonic/gin@v1.4.0...v1.9.1)

---
updated-dependencies:
- dependency-name: github.com/gin-gonic/gin
  dependency-type: direct:production
...

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

go.mod

@@ -2,21 +2,15 @@ module github.com/wisvch/mand
 
 require (
 	github.com/denisenkom/go-mssqldb v0.0.0-20190906004059-62cf760a6c9e // indirect
-	github.com/gin-contrib/sse v0.1.0 // indirect
-	github.com/gin-gonic/gin v1.4.0
-	github.com/golang/protobuf v1.3.2 // indirect
+	github.com/gin-gonic/gin v1.9.1
 	github.com/jinzhu/gorm v1.9.10
 	github.com/joho/godotenv v1.3.0
-	github.com/json-iterator/go v1.1.7 // indirect
 	github.com/kelseyhightower/envconfig v1.4.0
 	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
 	github.com/kr/pretty v0.1.0 // indirect
 	github.com/lib/pq v1.2.0 // indirect
-	github.com/mattn/go-isatty v0.0.9 // indirect
 	github.com/mattn/go-sqlite3 v1.11.0 // indirect
 	github.com/sirupsen/logrus v1.4.2
-	github.com/stretchr/testify v1.4.0 // indirect
-	github.com/ugorji/go v1.1.7 // indirect
 	golang.org/x/crypto v0.31.0 // indirect
 	google.golang.org/appengine v1.6.2 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect