fix: support ipv6 in connection

[yanksyoon]

Description

Current connection only supports ipv4 addresses, which throws a ValueError when ipv6 address is passed (int(port)).

Traceback (most recent call last):
  File "/home/yanks/Documents/canonical/jenkins-k8s-operator/.tox/integration/lib/python3.10/site-packages/pytest_asyncio/plugin.py", line 320, in _async_fixture_wrapper
    return event_loop.run_until_complete(setup())
  File "/usr/lib/python3.10/asyncio/base_events.py", line 646, in run_until_complete
    return future.result()
  File "/home/yanks/Documents/canonical/jenkins-k8s-operator/.tox/integration/lib/python3.10/site-packages/pytest_asyncio/plugin.py", line 317, in setup
    res = await func(**_add_kwargs(func, kwargs, event_loop, request))
  File "/home/yanks/Documents/canonical/jenkins-k8s-operator/tests/integration/conftest.py", line 159, in jenkins_machine_agent_fixture
    agent_app = await machine_model.deploy("jenkins-agent")
  File "/home/yanks/Documents/canonical/jenkins-k8s-operator/.tox/integration/lib/python3.10/site-packages/juju/model.py", line 1787, in deploy
    is_sub = await self.charmhub.is_subordinate(url.name)
  File "/home/yanks/Documents/canonical/jenkins-k8s-operator/.tox/integration/lib/python3.10/site-packages/juju/charmhub.py", line 35, in is_subordinate
    conn, headers, path_prefix = self.model.connection().https_connection()
  File "/home/yanks/Documents/canonical/jenkins-k8s-operator/.tox/integration/lib/python3.10/site-packages/juju/client/connection.py", line 699, in https_connection
    host, int(port),
ValueError: invalid literal for int() with base 10: '7b4b:909c:3c9a:216:3eff:fe98:cf21]:17070'

This change adds support for ipv6 addresses.

QA Steps

tox -e py3 -- tests/unit/...

tox -e integration -- tests/integration/...

All CI tests need to pass.

<Please note that most likely an additional test will be required by the reviewers for any change that's not a one liner to land.>

Notes & Discussion

<Additional notes for the reviewers if needed. Please delete section if not applicable.>

[jujubot]

Thanks for opening a pull request! Please follow the instructions here to ensure your pull request is ready for review. Then, a maintainer will review your patch.

@hpidcock @anvial @juanmanuel-tirado

[jujubot]

Thanks for opening a pull request! Please follow the instructions here to ensure your pull request is ready for review. Then, a maintainer will review your patch.

@hpidcock @anvial @juanmanuel-tirado

[cderici]

@yanksyoon Thanks for the PR! We do have another PR against the 2.9 branch for this that should've been forward ported already, I'll cherry pick from that one for consistency and future reference, so I'll close this one, thanks again 👍