main/busybox: upgrade to 1.36.0

Notable new features:

• HW acceleration for SHA1 and SHA256
  • Supported upstream for x86 and x86_64
  • Broken on x86 musl: http://lists.busybox.net/pipermail/busybox/2023-January/090078.html
• sleep(1) is an ash builtin now
• Custom helper script can now be supplied for udhcpc6
  • We still use /usr/share/udhcpc/default.script for both udhcpc and udhcpc6
  • It seems our default.script is not designed for IPv6 support
  • It may also be worthwhile to move udhcpc6 to -extra in the future
• Various bug fixes

New upstream applets:

• seedrng disabled in Alpine as it is provided by OpenRC already
• tsort (topological sort) disabled in Alpine
• tree (directory listings) enabled in Alpine