chore: return slash to cmake tests

Author: sevenbunu

tests/CMakeLists.txt

@@ -7,7 +7,7 @@ target_link_libraries(${TESTS_TARGET} PUBLIC gtest)
 target_link_libraries(${TESTS_TARGET} PUBLIC fast_matrix_market)
 
 target_compile_definitions(${TESTS_TARGET} PUBLIC
-                           TESTS_DATA_PATH="${CMAKE_CURRENT_SOURCE_DIR}/test_data")
+                           TESTS_DATA_PATH="${CMAKE_CURRENT_SOURCE_DIR}/test_data/")
 
 # tests files
 target_sources(${TESTS_TARGET} PUBLIC "rpq_tests.cpp")