requirements: add setuptools

From a fresh installation of Ubuntu 24.04 with build-essential
and other files, there was an error when following the build
instructions in the readme.

```
ModuleNotFoundError: No module named 'pkg_resources'
```

This was due to a missing `setuptools` package.

Add `setuptools` to `requirements.txt`.

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>

Author: Chris Friedt

requirements.txt

@@ -1,3 +1,4 @@
 project_generator==0.11.*
 Jinja2
 pyelftools
+setuptools