Bump the python-packages group in /backend with 3 updates

Bumps the python-packages group in /backend with 3 updates: [coverage](https://github.com/nedbat/coveragepy), [scrapy](https://github.com/scrapy/scrapy) and [flask](https://github.com/pallets/flask).


Updates `coverage` from 7.6.4 to 7.6.7
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.6.4...7.6.7)

Updates `scrapy` from 2.11.2 to 2.12.0
- [Release notes](https://github.com/scrapy/scrapy/releases)
- [Changelog](https://github.com/scrapy/scrapy/blob/master/docs/news.rst)
- [Commits](scrapy/scrapy@2.11.2...2.12.0)

Updates `flask` from 3.0.3 to 3.1.0
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@3.0.3...3.1.0)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: python-packages
- dependency-name: scrapy
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python-packages
- dependency-name: flask
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python-packages
...

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

backend/requirements.txt

@@ -1,12 +1,12 @@
-coverage==7.6.4
+coverage==7.6.7
 Twisted==24.10.0
 psycopg2-binary==2.9.10
 pylint==3.3.1
 SQLAlchemy==2.0.36
 price-parser==0.3.4
-Scrapy==2.11.2
+Scrapy==2.12.0
 nltk==3.9.1
-Flask==3.0.3
+Flask==3.1.0
 Flask-Cors==5.0.0
 Flask-Headers==1.0
 defusedxml==0.7.1