Bump the pip group across 2 directories with 4 updates

Bumps the pip group with 3 updates in the /requirements directory: [black](https://github.com/psf/black), [pymongo](https://github.com/mongodb/mongo-python-driver) and [requests](https://github.com/psf/requests).
Bumps the pip group with 1 update in the /tools/backups_viewer directory: [flask](https://github.com/pallets/flask).


Updates `black` from 23.3.0 to 24.3.0
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.3.0...24.3.0)

Updates `pymongo` from 3.12.1 to 4.6.3
- [Release notes](https://github.com/mongodb/mongo-python-driver/releases)
- [Changelog](https://github.com/mongodb/mongo-python-driver/blob/master/doc/changelog.rst)
- [Commits](mongodb/mongo-python-driver@3.12.1...4.6.3)

Updates `requests` from 2.28.1 to 2.31.0
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.28.1...v2.31.0)

Updates `flask` from 2.0.2 to 2.2.5
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.0.2...2.2.5)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: pymongo
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: requests
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: flask
  dependency-type: direct:production
  dependency-group: pip
...

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

requirements/base.txt

@@ -1,6 +1,6 @@
 colorthief==0.2.1
 python-dateutil==2.8.2
 discord.py==2.3.0
-pymongo==3.12.1
-requests==2.28.1
+pymongo==4.6.3
+requests==2.31.0
 lxml==4.9.2

requirements/black.txt

@@ -1 +1 @@
-black==23.3.0
+black==24.3.0

tools/backups_viewer/requirements.txt

@@ -1,3 +1,3 @@
-Flask==2.0.2
+Flask==2.2.5
 markdown==3.3.4
 python-dotenv==0.19.1