aider: Added import statement for tempfile module in tests/test_repomap.py.

# Context:
USER: I ran this command:

 pytest tests/test_repomap.py

And got this output:

============================= test session starts ==============================
platform darwin -- Python 3.11.3, pytest-7.3.1, pluggy-1.0.0
rootdir: /Users/gauthier/Projects/aider
collected 1 item

tests/test_repomap.py F                                                  [100%]

=================================== FAILURES ===================================
________________________ TestRepoMap.test_get_tags_map _________________________

self = <tests.test_repomap.TestRepoMap testMethod=test_get_tags_map>

    def test_get_tags_map(self):
        # Create a temporary directory with sample files for testing
        test_files = [
            "test_file1.py",
            "test_file2.py",
            "test_file3.md",
            "test_file4.json",
        ]

>       with tempfile.TemporaryDirectory() as temp_dir:
E       NameError: name 'tempfile' is not defined

tests/test_repomap.py:15: NameError
=========================== short test summary info ============================
FAILED tests/test_repomap.py::TestRepoMap::test_get_tags_map - NameError: nam...
============================== 1 failed in 0.05s ===============================

ASSISTANT: It looks like the `tempfile` module is not imported in the `tests/test_repomap.py` file. I will add the import statement for you.

```python
tests/test_repomap.py
<<<<<<< ORIGINAL
import os
import unittest
from aider.repomap import RepoMap
=======
import os
import tempfile
import unittest
from aider.repomap import RepoMap
>>>>>>> UPDATED
```

Now, you can run the test again with the `pytest tests/test_repomap.py` command.

tests/test_repomap.py

@@ -1,4 +1,5 @@
 import os
+import tempfile
 import unittest
 from aider.repomap import RepoMap