Build artifacts omit period from `.dev` segment (1.2.0b1)

[mtkennerly]

• 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: Windows 11
• Poetry version: 1.2.0b1
• pyproject.toml (just change the version to 1.11.1.dev1)

Issue

On 1.1.13, when the project version contains .devN, the build artifacts correctly contain a dot before dev:

$ grep -m 1 'version =' pyproject.toml
version = "1.11.1.dev1"

$ pip list | grep poetry
poetry                            1.1.13
poetry-core                       1.0.8

$ poetry version --short
1.11.1.dev1

$ poetry build
Building dunamai (1.11.1.dev1)
  - Building sdist
  - Built dunamai-1.11.1.dev1.tar.gz
  - Building wheel
  - Built dunamai-1.11.1.dev1-py3-none-any.whl

However, on 1.2.0b1, the dot is omitted, which violates PEP 440:

$ pip list | grep poetry
poetry                            1.2.0b1
poetry-core                       1.1.0a7

$ poetry version --short
1.11.1.dev1

$ poetry build
Building dunamai (1.11.1.dev1)
  - Building sdist
  - Built dunamai-1.11.1dev1.tar.gz
  - Building wheel
  - Built dunamai-1.11.1dev1-py3-none-any.whl

[dimbleby]

python-poetry/poetry-core#140.

Consider:

from poetry.core.utils.helpers import normalize_version

output = normalize_version("1.2.3.dev0")

Before, the output is 1.2.3.dev0. After, 1.2.3dev0.

[github-actions]

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