Fix stress builds (#85342)

Fix #85338, by switching to centos-stream8

Author: antonfirsov

eng/docker/libraries-sdk.linux.Dockerfile

@@ -1,5 +1,5 @@
 # Builds and copies library artifacts into target dotnet sdk image
-ARG BUILD_BASE_IMAGE=mcr.microsoft.com/dotnet-buildtools/prereqs:centos-7-f39df28-20191023143754
+ARG BUILD_BASE_IMAGE=mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream8
 ARG SDK_BASE_IMAGE=mcr.microsoft.com/dotnet/nightly/sdk:7.0-bullseye-slim
 
 FROM $BUILD_BASE_IMAGE as corefxbuild