Updated US source to: f457e94 Merge pull request openshift#482 from a…

…ravindhp/release-4.8-submodule-update-06-23

Updated upstream source commit.
Commit details follow:

Project: https://github.com/openshift/windows-machine-config-operator.git
Branch:  release-4.8
Commit:  f457e94
Author:  OpenShift Merge Robot
Date:    Thu, 24 Jun 2021 10:37:12 -0400

    Merge pull request openshift#482 from aravindhp/release-4.8-submodule-update-06-23

    [release-4.8] Bug 1973580: [submodule][kubelet] Update to 766a5fe58d1

Additional included commit: d63f268

automerge: yes
x-md5: 9a255e6bbb83073c59429a633ff70095
Change-Id: Ic67debad3c613ecbcb9890eca3a0de1cc9fccca4

upstream_sources.yml

@@ -1,5 +1,5 @@
 git:
 - automerge: 'yes'
   branch: release-4.8
-  commit: 45c2e82a3073d4366d641f1069734db5c97250b3
+  commit: f457e943a99ade64eb8b6b4311f26f54454f937d
   url: https://github.com/openshift/windows-machine-config-operator.git