ImagesManager.build extra_hosts argument not working

I am trying to pass extra_hosts argument to build without success.

Bellow is a simple way to reproduce this issue:
```
import podman
from podman import PodmanClient

CONTAINER_SOCKET_PATH = "unix:///var/run/docker.sock"

# Initialize the Podman client
client = PodmanClient(base_url=CONTAINER_SOCKET_PATH)

# Specify the path to your Dockerfile and context directory
dockerfile_path = "Dockerfile"
# context_path = '/path/to/your/context'

# Build the image
image, logs = client.images.build(
path="/private/tmp/tmp",
dockerfile=dockerfile_path,
tag="myimage:latest", # Replace with your desired image tag
rm=True, # Optional: Remove intermediate containers after build
extra_hosts={"example.com": "192.168.1.1"},
)

# Optionally, you can inspect the built image
print(f"Built image ID: {image.id}")
```

Without the extra_hosts argument, the code works fine.
With the extra_hosts argument I get:

```
podman.errors.exceptions.APIError: 400 Client Error: Bad Request (failed to parse query parameter 'extrahosts': "{\"repo\": \"147.204.144.142\"}": json: cannot unmarshal object into Go value of type []string)
```

Using the CLI also works:
```
podman buildx build --add-host=repo:147.204.144.142 --build-arg PACKAGE=mypackage --platform linux/amd64 -t s3loadtest .
```

Start at the client.images.build entry point and trace how extra_hosts becomes the API's extrahosts query parameter. Reproduce the example, compare its request with the working CLI --add-host form, and consider the issue done when the Python call accepts the host mapping without the API parse error.

Written by the indexing model from the issue text.