Update to latest base image

Dockerfile

@@ -3,7 +3,7 @@
 # Another Docker container should inherit with `FROM cernphsft/notebook`
 # to run actual services.
 
-FROM gitlab-registry.cern.ch/linuxsupport/cc7-base:20210715-1.x86_64
+FROM gitlab-registry.cern.ch/linuxsupport/cc7-base:20230801-1.x86_64
 
 LABEL maintainer="[email protected]"
 
@@ -53,7 +53,7 @@ RUN mkdir /tmp/pandoc && \
 
 # Install a newer version of TeX Live, than the one available in yum repos
 # For converting to PDF
-ENV PATH /usr/local/texlive/2021/bin/x86_64-linux/:$PATH
+ENV PATH /usr/local/texlive/2023/bin/x86_64-linux/:$PATH
 RUN mkdir /tmp/texlive && \
     cd /tmp/texlive && \
     wget --quiet http://mirror.ctan.org/systems/texlive/tlnet/install-tl-unx.tar.gz && \