fix packet encoding/decoding which seems to break after 2 billions packets sent #5220

Job	Run time
android_ndk_lts (aarch64-linux-android)	1m 16s
android_ndk_lts (armv7-linux-androideabi)	51s
android_ndk_lts (x86_64-linux-android)	1m 4s
android_ndk_lts (i686-linux-android)	57s
docker	2m 52s
http3_test	47s
nginx (1.16.1)	1m 16s
quiche_macos (macos-13)	4m 2s
quiche	3m 27s
quiche_ios (x86_64-apple-ios)	1m 12s
quiche_macos (macos-latest)	1m 43s
quiche (boringssl-boring-crate)	3m 20s
quiche_ios (aarch64-apple-ios)	1m 5s
quiche (openssl)	6m 26s
quiche_multiarch (aarch64-unknown-linux-gnu)	2m 49s
quiche_multiarch (armv7-unknown-linux-gnueabihf)	3m 4s
quiche_windows (x86_64-pc-windows-msvc)	3m 28s
quiche_windows (i686-pc-windows-msvc)	3m 44s
quiche_multiarch (i686-unknown-linux-gnu)	1m 30s
quiche_windows (x86_64-pc-windows-gnu)	6m 44s
quiche_windows (i686-pc-windows-gnu)	5m 10s
	56m 47s

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