Merge pull request #3284 from jrvaldes/r420-submodule-winexp-branch

[release-4.20] set windows_exporter submodule to 4.20 branch

Author: openshift-merge-bot[bot]

.gitmodules

@@ -12,6 +12,7 @@
 [submodule "windows_exporter"]
 	path = windows_exporter
 	url = https://github.com/openshift/prometheus-community-windows_exporter
+	branch = release-4.20
 [submodule "kubelet"]
 	path = kubelet
 	url = https://github.com/openshift/kubernetes