Use lower timeout for file parsing timeout test

Updating to Bookworm may have increased performance of the file
processing. In any case, this test started failing intermittently on
when running on a local machine. Lower the timeout so even fast
machines will hit the timeout.

tests/test_nsjail.py

@@ -233,7 +233,7 @@ def test_file_parsing_timeout(self):
             size = 32 * 1024 * 1024
 
             with open("file", "w") as f:
-                for _ in range((size // 1024) - 5):
+                for _ in range(size // 1024):
                     f.write(data)
 
             for i in range(100):
@@ -242,7 +242,7 @@ def test_file_parsing_timeout(self):
         ).strip()
         # A value higher than the actual memory needed is used to avoid the limit
         # on total file size being reached before the timeout when reading.
-        nsjail = NsJail(memfs_instance_size=512 * Size.MiB, files_timeout=1)
+        nsjail = NsJail(memfs_instance_size=128 * Size.MiB, files_timeout=0.1)
         result = nsjail.python3(["-c", code])
         self.assertEqual(result.returncode, None)
         self.assertEqual(