This PR changes to use ServerHttpResponse.getRawStatusCode() in WebFluxTags.

This PR also changes Spring Framework version to 5.2.4.BUILD-SNAPSHOT for the necessary upstream change.

See https://github.com/spring-projects/spring-boot/issues/19367#issuecomment-580182069

Comment From: dreis2211

You were a minute faster than me 😆

Comment From: wilkinsona

2.3.0.M2 is going to ship before Framework 5.2.4 (it'll stick on 5.2.3). Let's merge this into 2.2.x after 2.3.0.M2 has shipped. It can then be merged forwards into master at the same time.

Comment From: spencergibb

Since boot 2.2.x is on framework 5.2.3 will boot 2.2.x get framework 5.2.4? spring cloud gateway could make a similar change in Hoxton based on boot 2.2.x

Comment From: wilkinsona

Yep. 2.2.5 will ship on top of Framework 5.2.4.

Comment From: snicoll

We've missed this one, sorry about that. It'll be available in 2.2.6 rather.