Use https instead of git protocols

The github CI bots is not happy about the git protocols. Let's try to
use https protocols still.

cmake/FindGTest.cmake

@@ -5,13 +5,15 @@ else()
     message(STATUS "Not all GTest variable got specified: "
                    "'GMOCK_INCLUDE_DIR', 'GTEST_INCLUDE_DIR', "
                    "'GTEST_LIBRARIES', 'GMOCK_LIBRARIES'")
-    message(STATUS "fetch GTest from git@github.com:google/googletest.git")
+    message(STATUS "fetch GTest from https://github.com/google/googletest.git")
     include(FetchContent)
     FetchContent_Declare(
         googletest
-        GIT_REPOSITORY git@github.com:google/googletest.git
+        GIT_REPOSITORY https://github.com/google/googletest.git
         GIT_TAG release-1.11.0
+        GIT_SHALLOW ON
     )
+
     set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
     set(BUILD_GMOCK ON CACHE BOOL "" FORCE)
     set(BUILD_GTEST ON CACHE BOOL "" FORCE)