chore(deps): bump github.com/casbin/casbin/v2 from 2.73.1 to 2.77.1

Bumps [github.com/casbin/casbin/v2](https://github.com/casbin/casbin) from 2.73.1 to 2.77.1.
- [Release notes](https://github.com/casbin/casbin/releases)
- [Changelog](https://github.com/casbin/casbin/blob/master/.releaserc.json)
- [Commits](casbin/casbin@v2.73.1...v2.77.1)

---
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>

go.mod

@@ -3,7 +3,7 @@ module github.com/gin-contrib/authz
 go 1.20
 
 require (
-	github.com/casbin/casbin/v2 v2.73.1
+	github.com/casbin/casbin/v2 v2.77.1
 	github.com/gin-gonic/gin v1.9.1
 )
 

go.sum

@@ -4,8 +4,8 @@ github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1
 github.com/bytedance/sonic v1.10.0-rc/go.mod h1:ElCzW+ufi8qKqNW0FY314xriJhyJhuoJ3gFZdAHF7NM=
 github.com/bytedance/sonic v1.10.0-rc3 h1:uNSnscRapXTwUgTyOF0GVljYD08p9X/Lbr9MweSV3V0=
 github.com/bytedance/sonic v1.10.0-rc3/go.mod h1:iZcSUejdk5aukTND/Eu/ivjQuEL0Cu9/rf50Hi0u/g4=
-github.com/casbin/casbin/v2 v2.73.1 h1:E7ncCA4EVAjJVSfYcfguQOYFbSJcWlLVBSqipLtAqxI=
-github.com/casbin/casbin/v2 v2.73.1/go.mod h1:mzGx0hYW9/ksOSpw3wNjk3NRAroq5VMFYUQ6G43iGPk=
+github.com/casbin/casbin/v2 v2.77.1 h1:+H46VamJCTlmCPcb0N99Zaj4tSorfuvBh3v5lyGopeU=
+github.com/casbin/casbin/v2 v2.77.1/go.mod h1:mzGx0hYW9/ksOSpw3wNjk3NRAroq5VMFYUQ6G43iGPk=
 github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
 github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
 github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d h1:77cEq6EriyTZ0g/qfRdp61a3Uu/AWrgIq2s0ClJV1g0=