Bump qs from 6.5.2 to 6.5.3 in /backend

Bumps [qs](https://github.com/ljharb/qs) from 6.5.2 to 6.5.3.
- [Release notes](https://github.com/ljharb/qs/releases)
- [Changelog](https://github.com/ljharb/qs/blob/main/CHANGELOG.md)
- [Commits](https://github.com/ljharb/qs/compare/v6.5.2...v6.5.3)

---
updated-dependencies:
- dependency-name: qs
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -6,7 +6,7 @@ COPY ffmpeg-fetch.sh .
 RUN sh ./ffmpeg-fetch.sh
 
 
-# Create our Ubuntu 22.04 with node 16
+# Create our Ubuntu 22.04 with node 16.14.2 (that specific version is required as per: https://stackoverflow.com/a/72855258/8088021)
 # Go to 20.04
 FROM ubuntu:20.04 AS base
 ARG DEBIAN_FRONTEND=noninteractive
@@ -21,7 +21,8 @@ RUN groupadd -g $GID $USER && useradd --system -m -g $USER --uid $UID $USER && \
     apt install -y --no-install-recommends curl ca-certificates tzdata && \
     curl -fsSL https://deb.nodesource.com/setup_16.x | bash - && \
     apt install -y --no-install-recommends nodejs && \
-    npm -g install npm && \
+    npm -g install npm n && \
+    n 16.14.2 && \
     apt clean && \
     rm -rf /var/lib/apt/lists/*