Update python pimped image

python-pimped/Dockerfile

-FROM python:3.9-buster
+FROM python:3.10-buster
 LABEL maintainer="Teckids e.V. <verein@teckids.org>"
 
 ENV LANG=C.UTF-8
@@ -21,9 +21,9 @@ RUN apt-get -y update && \
 			  libldap2-dev \
 			  libssl-dev \
 			  libsasl2-dev \
-			  python3.7-dev
+			  python3.10-dev
 
-RUN pip install poetry tox
+RUN pip install poetry==1.2.0a2 tox
 
 RUN apt-get clean && \
     apt-get autoremove &&\