Upgrade containerd2 2.1.6 → 2.2.3 (2.1 stream active support ends 2026-05)

[acortelyou]

Is your feature request related to a problem? Please describe.

containerd2 (in SPECS/containerd2/containerd2.spec) is at 2.1.6 on the 2.1 release stream.

• 🟣 2.1 goes EOL 2026-05-05.
• Newer upstream releases: 1
• Latest upstream release: 2.2.3 (stream 2.2)
• Reference: https://endoflife.date/containerd (checked 2026-04-22)

Describe the solution you'd like

Upgrade containerd2 to 2.2.3.

Describe alternatives you've considered

• Stay on 2.1, assume security maintenance after EOL on 2026-05-05.
• Retire the containerd2 package.

Additional context

Newer upstream releases:

Stream	LTS?	Latest release	Status	Active support ends	EOL
2.2		2.2.3	🟢 supported	2026-11-06	2026-11-06

Related work in this repo

• PR [AUTO-CHERRYPICK] Upgrade containerd2 version to 2.1.6 - branch 3.0-dev #16731 ([AUTO-CHERRYPICK] Upgrade containerd2 version to 2.1.6 - branch 3.0-dev) merged 2026-04-17 — moved 3.0-dev from 2.0 → 2.1.6. The 2.1 stream itself loses active support 2026-05-05; a follow-up bump to the 2.2 stream is needed.
• Older PRs [AUTOPATCHER-CORE] Upgrade containerd2 to 2.1.4 none #14945 (autopatcher to 2.1.4, never merged) and [AUTOPATCHER-CORE] Upgrade containerd2 to 2.0.6 none #14909 (within EOL 2.0 stream) are now obsolete given [AUTO-CHERRYPICK] Upgrade containerd2 version to 2.1.6 - branch 3.0-dev #16731.