[minor] updated requirement for dropbox

[hotfix] return {} if enable_password_policy and minimum_password_score is not set in System settings

Fix for success message and redirect url in webforms

Merge branch 'britlog-welcome_email' into develop

[Update] dropbox backup mechanism to support Dropbox's V2 api and generate access token via centralized redirect url

fixes https://github.com/frappe/erpnext/issues/9073

[docs] Changes in homepage and before.md

Fix mobile app error

merged hotfix branch to develop

frappe/erpnext#9406

Maintain aspect ratio in thumbnail

Make upload files private by default

Add the empty row in the excel report, fixes #9377

This unchecks the private box when uploading files by default. It's better to accidentally attach as private something that is meant to be public than to accidentally attach something as public which is meant to be private.

[fixes] fixed password strength, ignore password strength if password policy is disabled

[fix] set queue timeout explicitly while enqueuing a job