conjure-up: update cffi resource

[carlocab]

See #68463.

[carlocab]

==> FAILED
==> Testing conjure-up
/usr/bin/sandbox-exec -f /private/tmp/homebrew20210112-8858-bob7ja.sb ruby -W0 -I $LOAD_PATH -- /opt/homebrew/Library/Homebrew/test.rb /opt/homebrew/Library/Taps/homebrew/homebrew-core/Formula/conjure-up.rb --verbose
==> /opt/homebrew/Cellar/conjure-up/2.6.14_3/bin/conjure-up --version
/opt/homebrew/Cellar/conjure-up/2.6.14_3/libexec/lib/python3.9/site-packages/macaroonbakery/bakery/_macaroon.py:119: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if cav.condition is not '':
/opt/homebrew/Cellar/conjure-up/2.6.14_3/libexec/lib/python3.9/site-packages/pyVmomi/Version.py:26: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if isLegacy or ns is "":
==> /opt/homebrew/Cellar/conjure-up/2.6.14_3/bin/conjure-up openstack-base metal --show-env
/opt/homebrew/Cellar/conjure-up/2.6.14_3/libexec/lib/python3.9/site-packages/macaroonbakery/bakery/_macaroon.py:119: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if cav.condition is not '':
/opt/homebrew/Cellar/conjure-up/2.6.14_3/libexec/lib/python3.9/site-packages/pyVmomi/Version.py:26: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if isLegacy or ns is "":
]2;conjure-up�Traceback (most recent call last):
  File "/opt/homebrew/Cellar/conjure-up/2.6.14_3/bin/conjure-up", line 33, in <module>
    sys.exit(load_entry_point('conjure-up==2.6.14', 'console_scripts', 'conjure-up')())
  File "/opt/homebrew/Cellar/conjure-up/2.6.14_3/libexec/lib/python3.9/site-packages/conjureup/app.py", line 283, in main
    juju.set_bin_path()
  File "/opt/homebrew/Cellar/conjure-up/2.6.14_3/libexec/lib/python3.9/site-packages/conjureup/juju.py", line 52, in set_bin_path
    _check_bin_candidates(candidates, 'bin_path')
  File "/opt/homebrew/Cellar/conjure-up/2.6.14_3/libexec/lib/python3.9/site-packages/conjureup/juju.py", line 38, in _check_bin_candidates
    raise errors.JujuBinaryNotFound(
conjureup.errors.JujuBinaryNotFound: Unable to locate a candidate executable for ['/snap/bin/juju', '/snap/bin/conjure-up.juju', '/usr/bin/juju', '/usr/local/bin/juju'].
/usr/bin/curl --version
/usr/libexec/java_home --xml --failfast
Error: conjure-up: failed
An exception occurred within a child process:
  BuildError: Failed executing: /opt/homebrew/Cellar/conjure-up/2.6.14_3/bin/conjure-up openstack-base metal --show-env