fix(deps): update module github.com/bufbuild/buf to v1.57.0 (flipt-io#4657)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

_tools/go.mod

@@ -3,7 +3,7 @@ module tools
 go 1.25.0
 
 require (
-	github.com/bufbuild/buf v1.55.1
+	github.com/bufbuild/buf v1.57.0
 	github.com/golangci/golangci-lint/v2 v2.4.0
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2
 	github.com/rakyll/gotest v0.0.6