John Niang 44cae84bc7 Bump versions to 2.21.0-SNAPSHOT (#7448) ...

#### What type of PR is this?

/kind cleanup
/area core
/milestone 2.21.x

#### What this PR does / why we need it:

This PR bumps versions to 2.21.0-SNAPSHOT, including ui packages and API client.

#### Does this PR introduce a user-facing change?

```release-note
None
```

2025-05-19 04:33:40 +00:00

..

v3_0

Bump versions to 2.21.0-SNAPSHOT (#7448)

2025-05-19 04:33:40 +00:00