containerd: bump to v1.4.3

This version bump incorporates the following fixes:

   727e1728d Prepare 1.4.3 release notes
   ae3a64aa1 containerd-shim: use path-based unix socket
   428f10fd2 Use path based unix socket for shims
   f2e4291b6 Prepare 1.4.2 release
   76f3d1955 Update mailmap for 1.4.2 release
   ca9950755 Update cri version to pickup unknown state fix
   0b97c6204 Update cri plugin
   c0f1add3c Fix Windows service panic file to not be read-only
   fbe18caa1 Update btrfs vendor for chkptr fix for Go >= 1.14
   cbbf257ab Add Go test runs to GitHub Actions CI
   19776b75b Adjust overlay tests to expect "index=off"
   7eb852214 Allow oom adj test to run in environments with a score
   036ede698 Import crypto for all snapshotters during testsuite
   5618423a0 Add comments clarifying copyWithBuffer implementation
   a2ebee357 replicate io.Copy optimizations
   9b2156aa8 Improve image pull performance from http 1.1 container registries
   56291a221 bug fix:#3448
   16e51fc31 Fix integer overflow on windows
   6ebd9a94a Update other actions for env/path CVE fix
   0a3488c71 Fix GH Actions CI deprecations
   cc3be9ae3 Bump Golang 1.15.5
   ebffce3ad seccomp: add pidfd_getfd syscall (gated by CAP_SYS_PTRACE)
   229f5ea4e seccomp: add pidfd_open and pidfd_send_signal
   e45f41e3a update to golang 1.15.2
   695516287 Remove setuid gosu in favor of "sudo -E PATH=$PATH ..."
   77931f801 ci: run critest target for all runtimes
   c745d237e Revendor CRI to get disabled annotation config default
   88e7f23bc Read trailing data from tar reader
   856a12fca Update github.com/Microsoft/hcsshim to v0.8.10
   cc6f72a00 Check if a process exists before returning it
   9a44af11d Windows CNI install script using lowercase "destdir"

Runtime testing completed on arm64 and x86-64, as well as with
orchestration engines.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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