updated yaml package requires a Loader

[Adam Dyess]

Each of the edge charms are affected by an issue with what seems to be a new version of yaml that affects the charm.
1.28/edge, 1.29/edge, latest/edge charms

unit-gcp-integrator-0: 2023-08-25 14:51:38 ERROR unit.gcp-integrator/0.juju-log Hook error:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-gcp-integrator-0/.venv/lib/python3.10/site-packages/charms/reactive/__init__.py", line 74, in main
    bus.dispatch(restricted=restricted_mode)
  File "/var/lib/juju/agents/unit-gcp-integrator-0/.venv/lib/python3.10/site-packages/charms/reactive/bus.py", line 390, in dispatch
    _invoke(other_handlers)
  File "/var/lib/juju/agents/unit-gcp-integrator-0/.venv/lib/python3.10/site-packages/charms/reactive/bus.py", line 359, in _invoke
    handler.invoke()
  File "/var/lib/juju/agents/unit-gcp-integrator-0/.venv/lib/python3.10/site-packages/charms/reactive/bus.py", line 181, in invoke
    self._action(*args)
  File "/var/lib/juju/agents/unit-gcp-integrator-0/charm/reactive/gcp.py", line 40, in get_creds
    toggle_flag("charm.gcp.creds.set", layer.gcp.get_credentials())
  File "/var/lib/juju/agents/unit-gcp-integrator-0/charm/lib/charms/layer/gcp.py", line 54, in get_credentials
    creds = yaml.load(result.stdout.decode("utf8"))
TypeError: load() missing 1 required positional argument: 'Loader'

Swapping out to yaml.safe_load() should fix it

[Adam Dyess (addyess)]

https://github.com/juju-solutions/charm-vsphere-integrator/pull/13
https://github.com/juju-solutions/charm-gcp-integrator/pull/17
https://github.com/juju-solutions/charm-aws-integrator/pull/49

Addressing in 3/4 of the cloud integrator charms

charm-openstack-integrator never seems to have had this issue

[Adam Dyess (addyess)]

backported to each of the three charm's release_1.28 branches