nghttp: Restore nghttp2 v1.24

We had already updated to v1.24 months ago, but the submodule commit was accidentally
reverted in 1fb85b494c5f381e00f856c4422563c4274fbe98.

Fixes (again) error when compiling with assertions disabled.

As reported on forum: https://esp32.com/viewtopic.php?f=13&t=2750&p=13069

diff --git a/components/nghttp/nghttp2 b/components/nghttp/nghttp2
index 2f146e4d4cfe895d65599b87df7d847435f0e1b4..3bcc416e13cc790e2fb45fcfe9111d38609c5032 160000 (submodule)
--- a/components/nghttp/nghttp2
+++ b/components/nghttp/nghttp2
@@ -1 +1 @@
-Subproject commit 2f146e4d4cfe895d65599b87df7d847435f0e1b4
+Subproject commit 3bcc416e13cc790e2fb45fcfe9111d38609c5032