LOOP-1211: Changed node version to 16 from latest for building assets

Author: jeppekroghitk

web/profiles/custom/os2loop/themes/os2loop_theme/README.md

@@ -15,8 +15,8 @@ Encore](https://symfony.com/doc/current/frontend/encore/installation.html#instal
 Build assets (JavaScript and CSS) by running
 
 ```sh
-docker run --volume ${PWD}:/app --workdir /app node:latest yarn install
-docker run --volume ${PWD}:/app --workdir /app node:latest yarn build
+docker run --volume ${PWD}:/app --workdir /app node:16 yarn install
+docker run --volume ${PWD}:/app --workdir /app node:16 yarn build
 ```
 
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