Update PyYaml dependency to 6.0.2 #125

python-poetry/poetry#8287

Note: This error originates from the build backend, and is likely not a problem with poetry but with pyyaml (6.0) not supporting PEP 517 builds. You can verify this by running 'pip wheel --no-cache-dir --use-pep517 "pyyaml (==6.0)"'.