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download_as_string is deprecated

The new download_as_bytes function should be used.

Exposed by related bug in externalsettings:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/gunicorn/arbiter.py", line 589, in spawn_worker
    worker.init_process()
  File "/usr/local/lib/python3.7/site-packages/gunicorn/workers/gthread.py", line 92, in init_process
    super().init_process()
  File "/usr/local/lib/python3.7/site-packages/gunicorn/workers/base.py", line 134, in init_process
    self.load_wsgi()
  File "/usr/local/lib/python3.7/site-packages/gunicorn/workers/base.py", line 146, in load_wsgi
    self.wsgi = self.app.wsgi()
  File "/usr/local/lib/python3.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
    self.callable = self.load()
  File "/usr/local/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 58, in load
    return self.load_wsgiapp()
  File "/usr/local/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 48, in load_wsgiapp
    return util.import_app(self.app_uri)
  File "/usr/local/lib/python3.7/site-packages/gunicorn/util.py", line 359, in import_app
    mod = importlib.import_module(module)
  File "/usr/local/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/src/app/authenticatorproject/wsgi.py", line 16, in <module>
    application = get_wsgi_application()
  File "/usr/local/lib/python3.7/site-packages/django/core/wsgi.py", line 12, in get_wsgi_application
    django.setup(set_prefix=False)
  File "/usr/local/lib/python3.7/site-packages/django/__init__.py", line 19, in setup
    configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
  File "/usr/local/lib/python3.7/site-packages/django/conf/__init__.py", line 79, in __getattr__
    self._setup(name)
  File "/usr/local/lib/python3.7/site-packages/django/conf/__init__.py", line 66, in _setup
    self._wrapped = Settings(settings_module)
  File "/usr/local/lib/python3.7/site-packages/django/conf/__init__.py", line 157, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/local/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/src/app/authenticatorproject/settings/__init__.py", line 8, in <module>
    from .base import *  # noqa: F401, F403
  File "/usr/src/app/authenticatorproject/settings/base.py", line 33, in <module>
    'EMAIL_HOST', 'EMAIL_HOST_PASSWORD', 'EMAIL_HOST_USER', 'EMAIL_PORT',
  File "/usr/local/lib/python3.7/site-packages/externalsettings/loader.py", line 107, in load_external_settings
    optional_settings=optional_settings
  File "/usr/local/lib/python3.7/site-packages/externalsettings/loader.py", line 121, in _fetch_external_settings
    _dict_deep_update(loaded_settings, _import_settings_url(url))
  File "/usr/local/lib/python3.7/site-packages/externalsettings/loader.py", line 176, in _import_settings_url
    return yaml.safe_load(_fetch_url(url))
  File "/usr/local/lib/python3.7/site-packages/externalsettings/loader.py", line 197, in _fetch_url
    return _fetch_storage_url(components)
  File "/usr/local/lib/python3.7/site-packages/externalsettings/loader.py", line 237, in _fetch_storage_url
    return blob.download_as_string()
  File "/usr/local/lib/python3.7/site-packages/google/cloud/storage/blob.py", line 1521, in download_as_string
    _DOWNLOAD_AS_STRING_DEPRECATED, PendingDeprecationWarning, stacklevel=2
TypeError: expected string or bytes-like object