Bump ujson from 5.2.0 to 5.4.0

Bumps [ujson](https://github.com/ultrajson/ultrajson) from 5.2.0 to 5.4.0.
- [Release notes](https://github.com/ultrajson/ultrajson/releases)
- [Commits](ultrajson/ultrajson@5.2.0...5.4.0)

---
updated-dependencies:
- dependency-name: ujson
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements-optional.txt

@@ -5,7 +5,7 @@
 # Generally, don't mess with this file unless you know what you are doing.
 
 ## MPDS
-ujson==5.2.0
+ujson==5.4.0
 jmespath==1.0.0
 httplib2==0.20.4
 ase==3.22.1