Changed node version to 20

Dockerfile

@@ -6,7 +6,7 @@ RUN apt-get update && apt-get install -y ca-certificates curl gnupg
 RUN mkdir -p /etc/apt/keyrings
 RUN curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
 
-ENV NODE_MAJOR=18
+ENV NODE_MAJOR=20
 RUN echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | tee /etc/apt/sources.list.d/nodesource.list
 RUN apt-get update && apt-get install nodejs -y