core Dockerfile node upgrade

(cherry picked from commit a1fc849)

Author: ihaardik

Dockerfile-core

@@ -40,7 +40,7 @@ RUN useradd -r -M -U -d /opt/countly -s /bin/false countly && \
         gcc g++ make binutils autoconf automake autotools-dev libtool pkg-config zlib1g-dev libcunit1-dev libssl-dev libxml2-dev libev-dev \
         libevent-dev libjansson-dev libjemalloc-dev cython python3-dev python-setuptools && \
     # node
-    wget -qO- https://deb.nodesource.com/setup_18.x | bash - && \
+    wget -qO- https://deb.nodesource.com/setup_20.x | bash - && \
     # data_migration (mongo clients)
     wget -qO - https://www.mongodb.org/static/pgp/server-6.0.asc | sudo apt-key add - && \
     echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/6.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-6.0.list && \