codecparsers: update to gst-vaapi-branch commit 843ce3e.

843ce3e jpeg: fix default Huffman tables generation.
8655187 mpeg2: fix the pixel-aspect-ratio calculation
21099dc mpeg2: actually store video bitrate values
dd02087 mpeg2: fix picture packet extension size check
25948e9 mpeg2: increase min size for picture coding ext
f1f5a40 ensure the debug category is properly initialized

diff --git a/ext/codecparsers b/ext/codecparsers
index 500bc02..843ce3e 160000 (submodule)
--- a/ext/codecparsers
+++ b/ext/codecparsers
@@ -1 +1 @@
-Subproject commit 500bc02db4c55727d81d153da4e378d2420bedd8
+Subproject commit 843ce3e0041b37cde3349ca285918c145d66d0d0