Use windows-2019 in workflows (#12183)
Use windows-2019 in workflows (#12183)

Motivation:

windows-2016 was removed so we need to use the next lowest which is 2019

Modifications:

- Use windows-2019

Result:

Builds on windows work again
netty/netty,doom369/netty,tbrooks8/netty,tbrooks8/netty,netty/netty,netty/netty,doom369/netty,tbrooks8/netty,doom369/netty,netty/netty,tbrooks8/netty,netty/netty,doom369/netty,tbrooks8/netty,doom369/netty