[1.2] fix: performance regression when parsing links from legacy repositories #6463
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…es (python-poetry#6442) Resolves: python-poetry#6436 Measurements of `poetry lock` with warm cache with example pyproject.toml from python-poetry#6436: |test case|time in s|peak memory usage in MB| |---|---|---| |legacy repository (before)|422|113| |legacy repository (after)|3|118| |pypi repository|1|92| `backports.cached-property` is used in order to support cached_property on Python 3.7. (cherry picked from commit c4b2253) Co-authored-by: Jarrod Moore <jmo@jmo.name> Co-authored-by: Bjorn Neergaard <bjorn@neersighted.com>
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Backport of #6442