fix: Limited NodeJS version to v16.15

backend/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:16
+FROM node:16.15
 
 RUN npm install -g nodemon
 

frontend/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:16
+FROM node:16.15
 
 RUN apt-get update
 RUN apt-get install nginx -y