package/nghttp2: security bump to version 1.39.2

Fixes the following security issues:

CVE-2019-9511: Data Dribble
CVE-2019-9513: Resource Loop

For details, see the advisory:
https://nghttp2.org/blog/2019/08/19/nghttp2-v1-39-2/

Notice that libnghttp2 itself is not affected by these vulnerabilities, only
nghttpx and nghttpd (which are currently not built).

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2 files changed