Image promotion for releng 1.21.12-bookworm-0

Signed-off-by: cpanato <[email protected]>

Author: cpanato

registry.k8s.io/images/k8s-staging-releng/images.yaml

@@ -79,6 +79,7 @@
     "sha256:b44d4e0b1589f43b7b5532792f9b6cc01214732c33ddf038b9c8b1c00d695725": ["1.21.1-bookworm-0"]
     "sha256:898b669d4869336e3c7a259e3a84e2d6a79b7b68366ee4dda1dc4af1f8995c8c": ["1.21.10-bookworm-0"]
     "sha256:b969c6de9bf86f37e6e737d2896c9dd0bab7b8ddcb7d85abf82514378472c277": ["1.21.11-bookworm-0"]
+    "sha256:6e5ed437be143dc5d592613abf84bba429f49068fccf28abeaccee100ff8193a": ["1.21.12-bookworm-0"]
     "sha256:bc66fd93c0cdfb1842cb56a244ec6af895d789e773d73a6758627e26aa7fc2ef": ["1.21.2-bookworm-0"]
     "sha256:6acd0f229ad4770b55d93ba5ad1dd36cc0a05bfbe13834246b2e23c530b73428": ["1.21.3-bookworm-0"]
     "sha256:daad40920c5d54533d62bc1eb90d2e6f0d646a0621f1a8ae961bbc7f44a988a4": ["1.21.4-bookworm-0"]