Update docker container to mcr (#35623)

BrennanConroy · web-flow · commit 30a215c882c5 · 2021-08-23T16:02:20.000-07:00
diff --git a/eng/docker/bionic.Dockerfile b/eng/docker/bionic.Dockerfile
@@ -1,4 +1,4 @@
-FROM microsoft/dotnet:2.1-runtime-deps-bionic
+FROM mcr.microsoft.com/dotnet/runtime-deps:2.1-bionic
 
 ARG USER
 ARG USER_ID

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-FROM microsoft/dotnet:2.1-runtime-deps-bionic`
	`1`	`+FROM mcr.microsoft.com/dotnet/runtime-deps:2.1-bionic`
`2`	`2`
`3`	`3`	`ARG USER`
`4`	`4`	`ARG USER_ID`