chore: upgrading poetry

GitHub test workflow was pinning Poetry to v1.3.2 due to issue 7611 [1].
But that Poetry version blocks the installation of typing-extensions
4.7.1 on Python 3.12 due to multiple deprecated methods and classes
being removed.

Since Poetry v1.4.0 resolved 7611 [1], it unblocks the installation of
typing-extensions >4.7.1 on Python 3.12 for Windows.

[1]: python-poetry/poetry#7611

Signed-off-by: Silvano Cirujano Cuesta <silvano.cirujano-cuesta@siemens.com>

.github/workflows/main.yaml

@@ -25,8 +25,7 @@ jobs:
       #          install poetry
       #----------------------------------------------
       - name: Install Poetry
-        # Pin to 1.3.2 to workaround https://github.com/python-poetry/poetry/issues/7611
-        run: pipx install poetry==1.3.2
+        run: pipx install poetry==1.4.0
 
       #----------------------------------------------
       #       check-out repo and set-up python