Bump google.golang.org/grpc from 1.56.2 to 1.57.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.56.2 to 1.57.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.56.2...v1.57.0)

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

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

vendor/google.golang.org/grpc/internal/envconfig/envconfig.go

@@ -40,6 +40,9 @@ var (
 	// pick_first LB policy, which can be enabled by setting the environment
 	// variable "GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG" to "true".
 	PickFirstLBConfig = boolFromEnv("GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG", false)
+	// ALTSMaxConcurrentHandshakes is the maximum number of concurrent ALTS
+	// handshakes that can be performed.
+	ALTSMaxConcurrentHandshakes = uint64FromEnv("GRPC_ALTS_MAX_CONCURRENT_HANDSHAKES", 100, 1, 100)
 )
 
 func boolFromEnv(envVar string, def bool) bool {