test: temporary workaround for an upstream regression in googletest (see #571)

test/CMakeLists.txt

@@ -13,8 +13,8 @@ else()
     FetchContent_Declare(
         googletest
         GIT_REPOSITORY https://github.com/google/googletest.git
-        GIT_TAG master
-        GIT_SHALLOW 1
+        GIT_TAG v1.10.x
+        # GIT_SHALLOW 1
     )
 
     FetchContent_GetProperties(googletest)