build(deps): bump github.com/casbin/casbin/v2 in /casbin

Bumps [github.com/casbin/casbin/v2](https://github.com/casbin/casbin) from 2.87.1 to 2.88.0.
- [Release notes](https://github.com/casbin/casbin/releases)
- [Changelog](https://github.com/casbin/casbin/blob/master/.releaserc.json)
- [Commits](casbin/casbin@v2.87.1...v2.88.0)

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

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

casbin/go.mod

@@ -3,7 +3,7 @@ module github.com/gofiber/contrib/casbin
 go 1.18
 
 require (
-	github.com/casbin/casbin/v2 v2.87.1
+	github.com/casbin/casbin/v2 v2.88.0
 	github.com/gofiber/fiber/v2 v2.52.4
 )
 

casbin/go.sum

@@ -1,7 +1,7 @@
 github.com/andybalholm/brotli v1.0.5 h1:8uQZIdzKmjc/iuPu7O2ioW48L81FgatrcpfFmiq/cCs=
 github.com/andybalholm/brotli v1.0.5/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
-github.com/casbin/casbin/v2 v2.87.1 h1:7H+ENAfYt3HmZJVw++tJsxx/ko7WEHsfNzpOdYTkpYo=
-github.com/casbin/casbin/v2 v2.87.1/go.mod h1:jX8uoN4veP85O/n2674r2qtfSXI6myvxW85f6TH50fw=
+github.com/casbin/casbin/v2 v2.88.0 h1:JFHId/aIFvNvPnTwUP+tTtVAjSh3eidslFzy+5LpSeU=
+github.com/casbin/casbin/v2 v2.88.0/go.mod h1:jX8uoN4veP85O/n2674r2qtfSXI6myvxW85f6TH50fw=
 github.com/casbin/govaluate v1.1.0 h1:6xdCWIpE9CwHdZhlVQW+froUrCsjb6/ZYNcXODfLT+E=
 github.com/casbin/govaluate v1.1.0/go.mod h1:G/UnbIjZk/0uMNaLwZZmFQrR72tYRZWQkO70si/iR7A=
 github.com/gofiber/fiber/v2 v2.52.4 h1:P+T+4iK7VaqUsq2PALYEfBBo6bJZ4q3FP8cZ84EggTM=