Upgrade Node.js to v16

Node.js v16 should run without emulation on the build platform, which
results in faster build times. This was the main reason to avoid
upgrading in a multi-platform setting.

Node.js v16 should also come with performance improvements during run
time.

Dockerfile

@@ -40,7 +40,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 # Install a specific Node.js version
 # https://github.com/nodesource/distributions/blob/0d81da75/README.md#installation-instructions
-RUN curl -fsSL https://deb.nodesource.com/setup_14.x | bash - \
+RUN curl -fsSL https://deb.nodesource.com/setup_16.x | bash - \
  && apt-get update && apt-get install -y nodejs
 
 # Used for platform-specific instructions
@@ -386,7 +386,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 # Install a specific Node.js version
 # https://github.com/nodesource/distributions/blob/0d81da75/README.md#installation-instructions
-RUN curl -fsSL https://deb.nodesource.com/setup_14.x | bash - \
+RUN curl -fsSL https://deb.nodesource.com/setup_16.x | bash - \
  && apt-get update && apt-get install -y nodejs
 
 # Used for platform-specific instructions