Add lockfile as an explicit dependency

[orf]

Resolves #7171

Whilst exploring why Homebrew/homebrew-core#117779 is failing, I saw the following traceback:

  File "/usr/local/Cellar/poetry/1.3.0/libexec/lib/python3.11/site-packages/poetry/puzzle/provider.py", line 37, in <module>
    from poetry.vcs.git import Git
  File "/usr/local/Cellar/poetry/1.3.0/libexec/lib/python3.11/site-packages/poetry/vcs/git/__init__.py", line 3, in <module>
    from poetry.vcs.git.backend import Git
  File "/usr/local/Cellar/poetry/1.3.0/libexec/lib/python3.11/site-packages/poetry/vcs/git/backend.py", line 21, in <module>
    from poetry.utils.authenticator import get_default_authenticator
  File "/usr/local/Cellar/poetry/1.3.0/libexec/lib/python3.11/site-packages/poetry/utils/authenticator.py", line 15, in <module>
    import lockfile
ModuleNotFoundError: No module named 'lockfile'

The lockfile module was missing from the resources block when it should have been present. However, Poetry is using the lockfile package directly despite it being brought in via an transient dependency:

poetry/src/poetry/utils/authenticator.py

Line 15 in aa48815

import lockfile

This MR adds it as a direct dependency.

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