Require ROOT 6.30/02 for all platforms for move to C++17.

For CI we will provide ROOT 6.30/02 for CentOS7, Ubuntu 20.04,22.04 and
macOS 12,13,14.

cmake/external/ROOT.cmake

@@ -3,7 +3,7 @@ include(utils)
 # Directory in which ROOT will be downloaded
 SET(ROOT_SOURCE_DIR "${CMAKE_THIRD_PARTY_DIR}/root")
 
-set(ROOT_TAR_FILE root_v6.22.06_python3.9_${DETECTED_OS_VERS}.tar.gz)
+set(ROOT_TAR_FILE root_v6.30.02_python3.9_${DETECTED_OS_VERS}.tar.gz)
 set(ROOT_SHA_KEY ${DETECTED_OS_VERS}-ROOT)
 if(APPLE)
   if("${DETECTED_OS_VERS}" MATCHES "^osx-14" OR
@@ -19,15 +19,15 @@ if(APPLE)
       set(ROOT_SHA_KEY osx-xcode-15.2-${DETECTED_ARCH}-ROOT)
     elseif("${XCODE_VERS}" GREATER_EQUAL "14.3")
       message(STATUS "##### Using ROOT builds for XCODE 14.3")
-      set(ROOT_TAR_FILE root_v6.29.01_cxx14_python3.9_osx-xcode-14.3-${DETECTED_ARCH}.tar.gz)
+      set(ROOT_TAR_FILE root_v6.30.02_cxx17_python3.9_osx-xcode-14.3-${DETECTED_ARCH}.tar.gz)
       set(ROOT_SHA_KEY osx-xcode-14.3-${DETECTED_ARCH}-ROOT)
     elseif("${XCODE_VERS}" GREATER_EQUAL "14.1")
       message(STATUS "##### Using ROOT builds for XCODE 14.1")
-      set(ROOT_TAR_FILE root_v6.26.06_cxx14_python3.9_osx-xcode-14.1-${DETECTED_ARCH}.tar.gz)
+      set(ROOT_TAR_FILE root_v6.30.02_cxx17_python3.9_osx-xcode-14.1-${DETECTED_ARCH}.tar.gz)
       set(ROOT_SHA_KEY osx-xcode-14.1-${DETECTED_ARCH}-ROOT)
     else()
       message(STATUS "##### Using ROOT builds for XCODE 13.1")
-      set(ROOT_TAR_FILE root_v6.25.01_cxx14_python3.9_osx-xcode-13.1-${DETECTED_ARCH}.tar.gz)
+      set(ROOT_TAR_FILE root_v6.30.02_cxx17_python3.9_osx-xcode-13.1-${DETECTED_ARCH}.tar.gz)
       set(ROOT_SHA_KEY osx-xcode-13.1-${DETECTED_ARCH}-ROOT)
     endif()
   elseif("${DETECTED_OS_VERS}" MATCHES "^osx-11")