RUSTSEC-2020-0048: Use-after-free in BodyStream due to lack of pinning

[github-actions]

Use-after-free in BodyStream due to lack of pinning

Details
Package	actix-http
Version	0.2.11
URL	actix/actix-web#1321
Date	2020-01-24
Patched versions	>= 2.0.0-alpha.1

Affected versions of this crate did not require the buffer wrapped in BodyStream to be pinned,
but treated it as if it had a fixed location in memory. This may result in a use-after-free.

The flaw was corrected by making the trait MessageBody require Unpin
and making poll_next() function accept Pin<&mut Self> instead of &mut self.

See advisory page for additional details.

[tmpolaczyk]

Actually, we are not using actix-http, it's only compiled because it's an optional dependency of actix, enabled by default.