Bump google.golang.org/grpc from 1.67.1 to 1.68.0 (#2597)

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.67.1 to 1.68.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.67.1...v1.68.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/xtls/xray-core v1.8.25-0.20241031075831-4ec5c78c3453
 	go.uber.org/atomic v1.11.0
 	golang.org/x/text v0.19.0
-	google.golang.org/grpc v1.67.1
+	google.golang.org/grpc v1.68.0
 	gorm.io/driver/sqlite v1.5.6
 	gorm.io/gorm v1.25.12
 )