Automatic merge from submit-queue

Add kube-proxy change notice to v1.7.3 release note

**What this PR does / why we need it**: Add necessary release note for issue #48600.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #48600 

**Special notes for your reviewer**:

This is suppose to be in v1.7.3 release note, but turned out I only updated release note on the cherrypick PR (#49799) instead of the original PR (#48625) so nothing got picked up :( 

/assign @bowei @wojtek-t 

**Release note**:

```release-note
NONE
```