build(deps): pin GoogleTest release

Use FetchContent with a fixed GoogleTest tag and preserve archive timestamps for reproducible builds.

Author: LimiNode

CMakeLists.txt

@@ -63,7 +63,9 @@ if(BUILD_TESTS)
     include(FetchContent)
     FetchContent_Declare(
         googletest
-        URL https://github.com/google/googletest/archive/refs/heads/main.zip
+        GIT_REPOSITORY https://github.com/google/googletest.git
+        GIT_TAG v1.14.0
+        DOWNLOAD_EXTRACT_TIMESTAMP TRUE
     )
     FetchContent_MakeAvailable(googletest)
     add_executable(test_all test_all.cpp)