tests: Update fetchcontent usage

Author: csparker247

tests/CMakeLists.txt

@@ -3,15 +3,10 @@ FetchContent_Declare(
     googletest
     GIT_REPOSITORY https://github.com/google/googletest.git
     GIT_TAG v1.14.0
+    EXCLUDE_FROM_ALL
 )
-
-FetchContent_GetProperties(googletest)
-if(NOT googletest_POPULATED)
-    set(INSTALL_GTEST OFF CACHE BOOL OFF FORCE)
-    FetchContent_Populate(googletest)
-    add_subdirectory(${googletest_SOURCE_DIR} ${googletest_BINARY_DIR} EXCLUDE_FROM_ALL)
-endif()
-
+set(INSTALL_GTEST OFF CACHE BOOL OFF FORCE)
+FetchContent_MakeAvailable(googletest)
 
 ## Build the tests ##
 set(tests