Update to gazelle 0.12.0 and run hack/update-bazel.sh

vendor/github.com/coreos/etcd/lease/BUILD

@@ -6,6 +6,7 @@ go_library(
         "doc.go",
         "lessor.go",
     ],
+    importmap = "vendor/github.com/coreos/etcd/lease",
     importpath = "github.com/coreos/etcd/lease",
     visibility = ["//visibility:public"],
     deps = [

vendor/github.com/coreos/etcd/lease/leasehttp/BUILD

@@ -6,6 +6,7 @@ go_library(
         "doc.go",
         "http.go",
     ],
+    importmap = "vendor/github.com/coreos/etcd/lease/leasehttp",
     importpath = "github.com/coreos/etcd/lease/leasehttp",
     visibility = ["//visibility:public"],
     deps = [

vendor/github.com/coreos/etcd/lease/leasepb/BUILD

@@ -3,6 +3,7 @@ load("@io_bazel_rules_go//go:def.bzl", "go_library")
 go_library(
     name = "go_default_library",
     srcs = ["lease.pb.go"],
+    importmap = "vendor/github.com/coreos/etcd/lease/leasepb",
     importpath = "github.com/coreos/etcd/lease/leasepb",
     visibility = ["//visibility:public"],
     deps = [