chore: bump version to v0.4.4 (#546)

## What type of PR is this?
/kind chore
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## What this PR does / why we need it:

bump version to v0.4.4

## Which issue(s) this PR fixes:

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Fixes #

Author: ruquanzhao

pkg/version/VERSION

@@ -1 +1 @@
-v0.4.2
+v0.4.4