#### What type of PR is this?
/kind cleanup
/area core
#### What this PR does / why we need it:
This PR bumps all version to 2.20.0 to prepare for next development.
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind cleanup
/area core
#### What this PR does / why we need it:
This is a regular updates after a new release.
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind cleanup
/area core
#### What this PR does / why we need it:
Regenerate API docs and client to prevent unrelated changes from other PRs.
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind feature
/milestone 2.15.x
/area core
#### What this PR does / why we need it:
增加了在用户尝试更新邮箱地址时进行密码验证的步骤。此举提高了安全性，确保邮箱修改操作由经过身份验证的用户执行。
#### Which issue(s) this PR fixes:
Fixes#5750
#### Does this PR introduce a user-facing change?
```release-note
更新邮箱地址时需进行密码验证
```
John Niang