[libc++][NFC] Bump Dockerfile to get latest nightly Clang

diff --git a/libcxx/utils/ci/Dockerfile b/libcxx/utils/ci/Dockerfile
index 947401b..ba44004 100644 (file)
--- a/libcxx/utils/ci/Dockerfile
+++ b/libcxx/utils/ci/Dockerfile
@@ -37,7 +37,7 @@ ENV DEBIAN_FRONTEND=noninteractive
 # CI builders to rebuild their copy of the Docker image. This is not a great
 # solution, however without that, the CI builders will keep the same cached
 # Docker image forever.
-RUN echo 5
+RUN echo 6
 
 RUN apt-get update && apt-get install -y bash curl