Poetry install not remove old dist-info in venv

[jean-helsinki]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu 20.04.3 LTS
• Poetry version: 1.1.8

Issue

After bump version in pyproject.toml and execute poetry install poetry not remove old dist-info folder from project venv:

ls ~/.cache/pypoetry/virtualenvs/poetry-bug-w3pEPh55-py3.8/lib/python3.8/site-packages/poetry_bug*
/home/user/.cache/pypoetry/virtualenvs/poetry-bug-w3pEPh55-py3.8/lib/python3.8/site-packages/poetry_bug.pth

/home/user/.cache/pypoetry/virtualenvs/poetry-bug-w3pEPh55-py3.8/lib/python3.8/site-packages/poetry_bug-0.1.0.dist-info:
INSTALLER  METADATA  RECORD

/home/user/.cache/pypoetry/virtualenvs/poetry-bug-w3pEPh55-py3.8/lib/python3.8/site-packages/poetry_bug-0.1.1.dist-info:
INSTALLER  METADATA  RECORD

This affect pkg_resources (and maybe other package utils) module behavior - pkg_resources.get_distribution(module_name) can take incorrect version for project.

pyproject.toml for reproduce bug is very basic:

[tool.poetry]
name = "poetry_bug"
version = "0.1.1"
description = ""
authors = ["Your Name <you@example.com>"]

[tool.poetry.dependencies]
python = "^3.8"

[tool.poetry.dev-dependencies]
pytest = "^5.2"

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

[finswimmer]

Hello @jean-helsinki,

this was reported earlier in #2855 and is fixed in the current preview release (1.2.0a2).

fin swimmer

[github-actions]

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