Update run_tests.sh

- Running `run_tests.sh` may give something this: `flavor(77629,0x1f3df8840) malloc: nano zone abandoned due to inability to reserve vm space.`.
- This only occurs only with this iterative script, but I don't get these warnings/errors/notices with `all.flv`, so this seems to be a 'non-issue'; at least for now.

#175

src/run_tests.sh

@@ -13,6 +13,7 @@ for test_file in "$TEST_DIR"/*.flv; do
 
     echo "Running test: $test_file"
     ./flavor "$test_file"
+    sleep 0.1 # Add a short delay to allow cleanup for macOS
 
     # Optionally check the exit code of each test
     if [ $? -ne 0 ]; then