Bump body-parser from 1.20.0 to 1.20.3 in /python/nav/web/static/js

Bumps [body-parser](https://github.com/expressjs/body-parser) from 1.20.0 to 1.20.3.
- [Release notes](https://github.com/expressjs/body-parser/releases)
- [Changelog](https://github.com/expressjs/body-parser/blob/master/HISTORY.md)
- [Commits](expressjs/body-parser@1.20.0...1.20.3)

---
updated-dependencies:
- dependency-name: body-parser
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>