Update Polly.Extensions.Http-Signed to 1.0.4
Update Polly.Extensions.Http-Signed to 1.0.4

Updates to the stable release we will use for RTM

(cherry picked from commit 57f338623b969194b32dd7ee3aa5a0d88de41c9f)

aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore