Dependency updates part 2

Update dependencies. This covers:

Bump pyjexl from 0.2.3 to 0.3.0 (from PR #1545)
Bump sphinx-rtd-theme from 0.4.3 to 1.0.0 (from PR #1546) (from PR #1544)
Bump pytest from 6.2.4 to 6.2.5 (from PR #1544)
Bump factory-boy from 3.2.0 to 3.2.1 (from PR #1542)
Bump python-decouple from 3.4 to 3.5 (from PR #1540)
Bump sentry-sdk from 0.14.3 to 1.5.0 (from PR #1539)
Bump django-extensions from 3.1.3 to 3.1.5 (from PR #1538)

Testing

Local testing is tricky with self-signed certs, but it's possible to run the service locally and browse the admin. I can also confirm the JSON response is rendered - eg

{"messages": [{"template": "simple_snippet", "template_version": "1.0.0", "content": {"text": "Admit it. You still haven't gotten over your child-like wonder of dinosaurs, right? Same. That's why you\u2019ll love this list of dino reads.", "icon": "https://0.0.0.0:8443/media/icons/1304091f-7240-484a-9a1a-9fbcb5eb5922.png", "button_label": "Read the Pocket Collection", "button_url": "https://getpocket.com/explore/item/the-ultimate-dinosaur-reading-list?utm_source=desktop-snippet&utm_medium=snippet&utm_campaign=&utm_term=&utm_content=", "section_title_icon": "https://0.0.0.0:8443/media/icons/094b0707-ab65-4b2e-99a1-a84122b6ab26.png", "section_title_text": "Messages from Firefox", "section_title_url": "https://support.mozilla.org/kb/snippets-firefox-faq?utm_source=desktop-snippet&utm_medium=snippet&utm_campaign=&utm_term=&utm_content=", "tall": false, "block_button_text": "Remove this", "do_not_autoblock": true, "links": {}}, "targeting": "", "id": "preview-14086"}]}

mozmeao / snippets-service

Dependency updates part 2 #1547

Testing