Update CMakeLists.txt

Use the 5.0.x branch until the 5.0.2 release is complete

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d56c0b0..e92342c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -116,7 +116,7 @@
 include(ExternalProject)
 ExternalProject_Add(datasketches
   GIT_REPOSITORY https://github.com/apache/datasketches-cpp.git
-  GIT_TAG 5.0.1
+  GIT_TAG origin/5.0.x
   GIT_SHALLOW true
   GIT_SUBMODULES ""
   INSTALL_DIR /tmp/datasketches