build: [NPM] update repo for ubuntu 20 (#2217)

* build: from ubuntu 20 (just adding whitespace)

* build: update repo

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Signed-off-by: Hunter Gregory <42728408+huntergregory@users.noreply.github.com>

npm/linux.Dockerfile

@@ -6,7 +6,7 @@ WORKDIR /usr/local/src
 COPY . .
 RUN CGO_ENABLED=0 go build -v -o /usr/local/bin/azure-npm -ldflags "-X main.version="$VERSION" -X "$NPM_AI_PATH"="$NPM_AI_ID"" -gcflags="-dwarflocationlists=true" npm/cmd/*.go
 
-FROM mcr.microsoft.com/oss/mirror/docker.io/library/ubuntu:20.04
+FROM mcr.microsoft.com/mirror/docker/library/ubuntu:20.04
 COPY --from=builder /usr/local/bin/azure-npm /usr/bin/azure-npm
 COPY --from=builder /usr/local/src/npm/scripts /usr/local/npm
 RUN apt-get update && apt-get install -y iptables ipset ca-certificates && apt-get autoremove -y && apt-get clean