[27.1 backport] update containerd binary to v1.7.20

[thaJeztah]

• backport update containerd binary to v1.7.20 #48190

Update the containerd binary that's used in CI and for the static packages.

release notes: https://github.com/containerd/containerd/releases/tag/v1.7.20
full diff: containerd/containerd@v1.7.18...v1.7.19

- Description for the changelog

Upgrade containerd to v1.7.20 (static binaries only).

- A picture of a cute animal (not mandatory but encouraged)

[thaJeztah]

ugh; looks like the new variant of the check doesn't work;

  # get the intended major version prefix ("[27.1 backport]" -> "27.") from the PR title.
  [[ "$PR_TITLE" =~ ^\[\([0-9]*\.\)[^]]*\] ]] && branch="${BASH_REMATCH[1]}"
  
  # get major version prefix from the release branch ("27.x -> "27.")
  [[ "$GITHUB_BASE_REF" =~ ^\([0-9]*\.\) ]] && target_branch="${BASH_REMATCH[1]}"
  
  if [[ "$GITHUB_BASE_REF" != "$branch" ]] && ! [[ "$GITHUB_BASE_REF" == "master" && "$branch" == "" ]]; then
      echo "::error::PR is opened against the $GITHUB_BASE_REF branch, but its title suggests otherwise."
      exit 1
  fi
  shell: /usr/bin/bash -e {0}
  env:
    PR_TITLE: [27.1 backport] update containerd binary to v1.7.20
Error: PR is opened against the 27.0 branch, but its title suggests otherwise.
Error: Process completed with exit code 1.

[thaJeztah]

@vvoland This one is green, except for the PR title check, but that should be fixed in the branch now