Upgrade gstreamer to 1.20

Upgrade gstreamer for amd64 and arm64 to the latest release from
Debian 12. Also includes notes on the backporting procedure used
to generate the packages. Don't bother with upgrading 32 bit arm
since we aren't actively supporting it.

Change-Id: I0a0ba6f08c1b8779522837ce70a12a4d83e0cf8c
Signed-off-by: Tyler Chatow <tchatow@gmail.com>
diff --git a/y2020/vision/sift/BUILD b/y2020/vision/sift/BUILD
index c6afc98..feecb62 100644
--- a/y2020/vision/sift/BUILD
+++ b/y2020/vision/sift/BUILD
@@ -32,7 +32,7 @@
         "fast_gaussian_generator.cc",
         "get_gaussian_kernel.h",
         "@amd64_debian_sysroot//:sysroot_files",
-        "@deb_zlib1g_dev_1_2_11_dfsg_1_amd64_deb_repo//file",
+        "@deb_zlib1g_dev_1_2_11_dfsg_2_amd64_deb_repo//file",
         "@halide_k8//:build_files",
         "@llvm_toolchain//:all-components-x86_64-linux",
     ],
diff --git a/y2020/vision/sift/fast_gaussian_halide_generator.sh b/y2020/vision/sift/fast_gaussian_halide_generator.sh
index a90f218..cec9995 100755
--- a/y2020/vision/sift/fast_gaussian_halide_generator.sh
+++ b/y2020/vision/sift/fast_gaussian_halide_generator.sh
@@ -25,7 +25,7 @@
 SOURCE="$(rlocation org_frc971/y2020/vision/sift/fast_gaussian_generator.cc)"
 HALIDE="$(rlocation halide_k8)"
 SYSROOT="$(rlocation amd64_debian_sysroot)"
-ZLIB1G_DEV_AMD64_DEB="$(rlocation deb_zlib1g_dev_1_2_11_dfsg_1_amd64_deb_repo/file/zlib1g-dev_1.2.11.dfsg-1_amd64.deb)"
+ZLIB1G_DEV_AMD64_DEB="$(rlocation deb_zlib1g_dev_1_2_11_dfsg_2_amd64_deb_repo/file/zlib1g-dev_1.2.11.dfsg-2_amd64.deb)"
 
 ZLIB1G_DEV="$(mktemp -d)"