update version of gtest to v1.15.2 (latest) and also the cmake config…

…uration to avoid deprecation warnings

cmake/GoogleTest.cmake.in

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.10..3.22)
 
 project(googletest-download NONE)
 
@@ -34,11 +34,11 @@ else()
     message(SEND_ERROR "Did not find Google Test sources! Either pass correct path in GOOGLETEST_PATH, or enable BENCHMARK_DOWNLOAD_DEPENDENCIES, or disable BENCHMARK_USE_BUNDLED_GTEST, or disable BENCHMARK_ENABLE_GTEST_TESTS / BENCHMARK_ENABLE_TESTING.")
     return()
   else()
-    message(WARNING "Did not find Google Test sources! Fetching from web...")
+    message(STATUS "Did not find Google Test sources! Fetching from web...")
     ExternalProject_Add(
       googletest
       GIT_REPOSITORY    https://github.com/google/googletest.git
-      GIT_TAG           "release-1.11.0"
+      GIT_TAG           "v1.15.2"
       PREFIX            "${CMAKE_BINARY_DIR}"
       STAMP_DIR         "${CMAKE_BINARY_DIR}/stamp"
       DOWNLOAD_DIR      "${CMAKE_BINARY_DIR}/download"