Feat: update CPM and dont use CPM cache for CPM download

Author: pingelit

cmake/CPM.cmake

@@ -1,12 +1,6 @@
-set(CPM_DOWNLOAD_VERSION 0.38.7)
+set(CPM_DOWNLOAD_VERSION 0.42.1)
 
-if(CPM_SOURCE_CACHE)
-  set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
-elseif(DEFINED ENV{CPM_SOURCE_CACHE})
-  set(CPM_DOWNLOAD_LOCATION "$ENV{CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
-else()
-  set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
-endif()
+set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
 
 if(NOT (EXISTS ${CPM_DOWNLOAD_LOCATION}))
   message(STATUS "Downloading CPM.cmake to ${CPM_DOWNLOAD_LOCATION}")