Bump windows/servercore in /release/preview/windowsservercore/dependabot

dependabot-preview[bot] · web-flow · commit 4a12a3a3281b · 2019-11-12T19:59:06.000Z
Bumps windows/servercore from 1903 to 1909.

Signed-off-by: dependabot-preview[bot] &lt;support@dependabot.com&gt;
diff --git a/release/preview/windowsservercore/dependabot/Dockerfile b/release/preview/windowsservercore/dependabot/Dockerfile
@@ -3,4 +3,4 @@
 
 # Dummy docker image to trigger dependabot PRs
 
-FROM mcr.microsoft.com/windows/servercore:1903
+FROM mcr.microsoft.com/windows/servercore:1909

Original file line number	Diff line number	Diff line change
`@@ -3,4 +3,4 @@`
`3`	`3`
`4`	`4`	`# Dummy docker image to trigger dependabot PRs`
`5`	`5`
`6`		`-FROM mcr.microsoft.com/windows/servercore:1903`
	`6`	`+FROM mcr.microsoft.com/windows/servercore:1909`