chore: remove go-cmp dependency after test cleanup

The go-cmp import was dropped from core/targethasher/graph_test.go
in the lint-fix commits but go.mod and MODULE.bazel were not updated.
Run go mod tidy and bazel mod tidy to reflect the removal.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sywhang

MODULE.bazel

@@ -32,7 +32,6 @@ use_repo(
     "com_github_goccy_go_yaml",
     "com_github_gogo_protobuf",
     "com_github_golang_mock",
-    "com_github_google_go_cmp",
     "com_github_stretchr_testify",
     "com_github_uber_go_tally",
     "org_golang_google_protobuf",

go.mod

@@ -8,7 +8,6 @@ require (
 	github.com/goccy/go-yaml v1.19.1
 	github.com/gogo/protobuf v1.3.2
 	github.com/golang/mock v1.7.0-rc.1
-	github.com/google/go-cmp v0.6.0
 	github.com/stretchr/testify v1.10.0
 	github.com/uber-go/tally v3.5.8+incompatible
 	go.uber.org/fx v1.24.0