chore(deps): bump the pip group across 1 directory with 5 updates

Bumps the pip group with 5 updates in the /backend directory:

| Package | From | To |
| --- | --- | --- |
| [python-multipart](https://github.com/Kludex/python-multipart) | `0.0.7` | `0.0.18` |
| [certifi](https://github.com/certifi/python-certifi) | `2023.7.22` | `2024.7.4` |
| [dnspython](https://github.com/rthalley/dnspython) | `2.4.2` | `2.6.1` |
| [idna](https://github.com/kjd/idna) | `3.4` | `3.7` |
| [jinja2](https://github.com/pallets/jinja) | `3.1.3` | `3.1.6` |



Updates `python-multipart` from 0.0.7 to 0.0.18
- [Release notes](https://github.com/Kludex/python-multipart/releases)
- [Changelog](https://github.com/Kludex/python-multipart/blob/master/CHANGELOG.md)
- [Commits](Kludex/python-multipart@0.0.7...0.0.18)

Updates `certifi` from 2023.7.22 to 2024.7.4
- [Commits](certifi/python-certifi@2023.07.22...2024.07.04)

Updates `dnspython` from 2.4.2 to 2.6.1
- [Release notes](https://github.com/rthalley/dnspython/releases)
- [Changelog](https://github.com/rthalley/dnspython/blob/main/doc/whatsnew.rst)
- [Commits](rthalley/dnspython@v2.4.2...v2.6.1)

Updates `idna` from 3.4 to 3.7
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.4...v3.7)

Updates `jinja2` from 3.1.3 to 3.1.6
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@3.1.3...3.1.6)

---
updated-dependencies:
- dependency-name: python-multipart
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: certifi
  dependency-type: indirect
  dependency-group: pip
- dependency-name: dnspython
  dependency-type: indirect
  dependency-group: pip
- dependency-name: idna
  dependency-type: indirect
  dependency-group: pip
- dependency-name: jinja2
  dependency-type: indirect
  dependency-group: pip
...

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

Author: dependabot[bot]