Don't try to parse the response json when not_modified

[jarovo]

In case of not_modified (HTTP 304), there is no json in the response body. Json parsing fails like:

        if response.status_code == requests.codes.not_modified:
            if kwargs.get("ignore", False):
                return

        body = response
>       raise APIError(body["cause"], response=response, explanation=body)
E       TypeError: 'APIResponse' object is not subscriptable

.venv/lib/python3.12/site-packages/podman/domain/containers.py:477: TypeError

This patch fixes this in the way that APIError is rised with content from the text of the requests response

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[inknos]

/packit rebuild-failed