Document poetry version and update

[palfrey]

I'm trying to do something else (test and fix mediadb_storage with Python 3.x), and ran into issues because the poetry.lock was generated with what I think is a 1.0.x version of poetry, and I needed 1.1.x for some bug fixes. They've since changed the lock format (which is annoying) and also added in a lock-version field inside there that at least documents what format was used. This PR should just update the poetry.lock and document a known-good "will get the same answers" version of poetry.

[codecov]

Codecov Report

Merging #43 (0532dcb) into master (25e6a85) will decrease coverage by 0.02%.
The diff coverage is 38.46%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   47.27%   47.24%   -0.03%     
==========================================
  Files          50       50              
  Lines       10826    10826              
==========================================
- Hits         5118     5115       -3     
- Misses       5708     5711       +3     

Flag	Coverage Δ
unittest	47.24% <38.46%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
coherence/backends/fs_storage.py	43.26% <0.00%> (ø)
coherence/upnp/core/service.py	66.44% <0.00%> (ø)
coherence/upnp/devices/media_server.py	33.33% <ø> (ø)
coherence/base.py	58.23% <40.00%> (-0.44%)	⬇️
coherence/upnp/core/device.py	73.41% <66.66%> (-0.06%)	⬇️
coherence/upnp/devices/control_point.py	38.33% <100.00%> (ø)

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[opacam]

👍 LGTM, thanks!!