deps: Upgrade pouchdb to v7.3.0

[taratatach]

This version should fix an issue preventing the deletion of migration databases on Windows.

Please make sure the following boxes are checked:

• [x] PR is not too big
• [x] it improves UX & DX in some way
• [ ] it includes unit tests matching the implementation changes
• [ ] it includes scenarios matching a new behaviour or has been manually tested
• [ ] it includes relevant documentation