gdma: squash the string truncation warning

Author: loriab

external/upstream/gdma/CMakeLists.txt

@@ -14,7 +14,7 @@ if(${ENABLE_gdma})
         message(STATUS "Suitable gdma could not be located, ${Magenta}Building gdma${ColourReset} instead.")
         ExternalProject_Add(gdma_external
             GIT_REPOSITORY https://github.com/psi4/gdma
-            GIT_TAG v2.2.6
+            GIT_TAG 9d607d7  # v2.2.6-2-g9d607d7
             UPDATE_COMMAND ""
             CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
                        -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}