[go1.15] Update to go1.15.7

Signed-off-by: Carlos Panato <ctadeu@gmail.com>

build/build-image/cross/VERSION

@@ -1 +1 @@
-v1.15.5-1
+v1.15.7-2

build/dependencies.yaml

@@ -99,7 +99,7 @@ dependencies:
 
   # Golang
   - name: "golang: upstream version"
-    version: 1.15.5
+    version: 1.15.7
     refPaths:
     - path: build/build-image/cross/VERSION
     - path: build/root/WORKSPACE
@@ -112,7 +112,7 @@ dependencies:
       match: 'default-go-version\: \d+.\d+(alpha|beta|rc)?\.?(\d+)?'
 
   - name: "k8s.gcr.io/kube-cross: dependents"
-    version: v1.15.5-1
+    version: v1.15.7-2
     refPaths:
     - path: build/build-image/cross/VERSION
     - path: test/images/sample-apiserver/Makefile

build/root/WORKSPACE

@@ -23,7 +23,7 @@ load("@io_k8s_repo_infra//:repos.bzl", repo_infra_configure = "configure", repo_
 #            'override_go_version': used to specify an alternate go version provided
 #                                   by kubernetes/repo-infra
 repo_infra_configure(
-    go_version = "1.15.5",
+    go_version = "1.15.7",
     minimum_bazel_version = "3.4.1",
 )