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fix: Update writePython3Bin docs
Was trying out the recommended example for `writePython3Bin` and it
failed with:
```
Traceback (most recent call last):
File "/nix/store/gcmhfm7mslpndjasfhvs66f1ca24vxim-test_py3/bin/test_py3", line 4, in <module>
y = yaml.load("""
TypeError: load() missing 1 required positional argument: 'Loader'
```
Looks like `yaml.load(input)` was deprecated in 5.1: https://msg.pyyaml.org/load
`nixos-24.05` uses `6.0.1` so we're in the clear.