try bumping to pre-release of 6.38

Author: tomeichlersmith

Dockerfile

@@ -144,12 +144,11 @@ RUN install-ubuntu-packages \
     srm-ifce-dev \
     libgsl-dev
 
-ENV ROOT_VERSION="6.36.04"
+ENV ROOT_VERSION="6.38.00-rc1"
 LABEL root.version=${ROOT_VERSION}
 RUN mkdir src &&\
     ${__wget} https://root.cern/download/root_v${ROOT_VERSION}.source.tar.gz |\
      ${__untar} &&\
-    sed -i '13i list(APPEND TREEPLAYER_EXTRA_DEPENDENCIES MultiProc)' src/tree/treeplayer/CMakeLists.txt &&\
     cmake \
       -DCMAKE_BUILD_TYPE=Release \
       -DCMAKE_CXX_STANDARD=20 \