Fix warning "##[warning]SetCookieHeaderValueTest.cs(423,67): warning CS8600: (NETCORE_ENGINEERING_TELEMETRY=Build) Converting null literal or possible null value to non-nullable type."

[wtgodbe]

Happens in main product build

##[warning]SetCookieHeaderValueTest.cs(423,67): warning CS8600: (NETCORE_ENGINEERING_TELEMETRY=Build) Converting null literal or possible null value to non-nullable type.

Part of #22240

[wtgodbe]

@Tratcher @jkotalik @BrennanConroy seems to be related to #22181

[Tratcher]

Yeah, that PR was developed in parallel to the nullability changes and then merged.

[wtgodbe]

@Tratcher so is this already fixed?

[Tratcher]

No

[wtgodbe]

Who was working on the nullability changes?

[BrennanConroy]

Likely Pranav

[BrennanConroy]

Fixed by #22838