Updated package build version and pyproject.toml

Updated poetry version to 2.0.1. Made edits to CI and pyproject to align with the new project header from PEP 621. No change to installation procedure

.gitlab-ci.yml

 default:
   image: python:3.12
 
-
 variables:
   PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
   PIP_INDEX_URL: "https://__token__:${CI_JOB_TOKEN}@gitlab.com/api/v4/projects/$CI_PROJECT_ID/packages/pypi/simple"
@@ -17,12 +16,12 @@ release:
   stage: release
   only:
     - main
+    - test-build
     - tags
   before_script:
     - python3 --version ; python3 -m pip --version  # For debugging
     - pip install --upgrade pip
-    - pip install poetry
-    - poetry self add "poetry-dynamic-versioning[plugin]"
+    - pip install poetry==2.0.1
     - poetry install
   script:
     - export POETRY_DYNAMIC_VERSIONING_DEBUG=1