deps: update libseccomp to 2.5.3

It was released about a month ago. I don't see anything major
in the changelog but it makes sense to keep tracking upstream deps.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

script/release_build.sh

@@ -19,7 +19,7 @@ set -e
 ## --->
 # Project-specific options and functions. In *theory* you shouldn't need to
 # touch anything else in this script in order to use this elsewhere.
-: "${LIBSECCOMP_VERSION:=2.5.2}"
+: "${LIBSECCOMP_VERSION:=2.5.3}"
 project="runc"
 root="$(readlink -f "$(dirname "${BASH_SOURCE[0]}")/..")"