chore(deps): bump github.com/casbin/casbin/v2 from 2.49.0 to 2.51.0

Bumps [github.com/casbin/casbin/v2](https://github.com/casbin/casbin) from 2.49.0 to 2.51.0.
- [Release notes](https://github.com/casbin/casbin/releases)
- [Changelog](https://github.com/casbin/casbin/blob/master/.releaserc.json)
- [Commits](casbin/casbin@v2.49.0...v2.51.0)

---
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>

go.mod

@@ -6,7 +6,7 @@ require (
 	cloud.google.com/go v0.103.0
 	github.com/Masterminds/semver/v3 v3.1.1
 	github.com/brianvoe/gofakeit v3.18.0+incompatible
-	github.com/casbin/casbin/v2 v2.49.0
+	github.com/casbin/casbin/v2 v2.51.0
 	github.com/go-sql-driver/mysql v1.6.0
 	github.com/google/uuid v1.3.0
 	github.com/opentracing/opentracing-go v1.2.0

go.sum

@@ -68,8 +68,8 @@ github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAE
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/brianvoe/gofakeit v3.18.0+incompatible h1:wDOmHc9DLG4nRjUVVaxA+CEglKOW72Y5+4WNxUIkjM8=
 github.com/brianvoe/gofakeit v3.18.0+incompatible/go.mod h1:kfwdRA90vvNhPutZWfH7WPaDzUjz+CZFqG+rPkOjGOc=
-github.com/casbin/casbin/v2 v2.49.0 h1:fHJZ1yPR7YvDXODaUEh42vwZSN0Jm1JePgaQuuN/UHA=
-github.com/casbin/casbin/v2 v2.49.0/go.mod h1:vByNa/Fchek0KZUgG5wEsl7iFsiviAYKRtgrQfcJqHg=
+github.com/casbin/casbin/v2 v2.51.0 h1:BC41imD9Z2coIJpELapy2h5kMT+lB4vFDTYpMhTsU4A=
+github.com/casbin/casbin/v2 v2.51.0/go.mod h1:vByNa/Fchek0KZUgG5wEsl7iFsiviAYKRtgrQfcJqHg=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=