Dockerfile: update containerd binary to v1.7.26

- full diff: https://github.com/containerd/containerd/compare/v1.7.25...v1.7.26
- release notes: https://github.com/containerd/containerd/releases/tag/v1.7.26

Welcome to the v1.7.26 release of containerd!

The twenty-sixth patch release for containerd 1.7 contains various fixes
and updates.

Highlights

- Add support for syncfs after unpack
- Update runc binary to v1.2.55
- Fix race between serve and immediate shutdown on the server
- Reject oversized messages from the sender

Container Runtime Interface (CRI)

- Fix fatal concurrency error in port forwarding

Node Resource Interface (NRI)

- Fix initial sync race when registering NRI plugins
- Add API support for reading Pod IPs
- Fix plugin sync to use multiple messages if ttrpc max message limit is hit
- Update API to pass configured timeouts to plugins.
- Fix mount removal in adjustments
- Close plugin if initial synchronization fails
- Add support for adjusting OOM score
- Add API support for NRI-native CDI injection
- Add support for pids cgroup

Runtime

- Fix console TTY leak in runc shim

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

hack/dockerfile/install/containerd.installer

@@ -15,7 +15,7 @@ set -e
 # the binary version you may also need to update the vendor version to pick up
 # bug fixes or new APIs, however, usually the Go packages are built from a
 # commit from the master branch.
-: "${CONTAINERD_VERSION:=v1.7.25}"
+: "${CONTAINERD_VERSION:=v1.7.26}"
 
 install_containerd() (
 	echo "Install containerd version $CONTAINERD_VERSION"