Use Python 3.12 in the backend

backend/Dockerfile

-FROM python:3.8.6
+FROM python:3.12
  MAINTAINER Tamas Gal <tgal@km3net.de>
 
  WORKDIR /monitoring

backend/requirements.txt

 docopt==0.6.2
-km3db==0.11.1
-km3io==0.29.0
-km3pipe==9.13.9
-matplotlib==3.6.2
-numba==0.56.4
-numpy==1.23.4
-pandas==1.5.1
-requests==2.27.1
-rocketchat-API==1.25.0
-RocketChatAPIBot==0.1.4
-seaborn==0.12.1
-supervisor==4.2.4
+km3db==0.14.3
+km3io==1.2.2
+km3pipe==10.0.1
+matplotlib==3.10.0
+numba==0.61.0
+numpy==2.1.3
+pandas==2.2.3
+requests==2.32.3
+rocketchat-API==1.34.0
+pyrocketbot==1.0.5
+seaborn==0.13.2
+supervisor==4.2.5
 toml==0.10.2