sops: the combined cc-ci host's ssh host key is a recipient (secrets submodule bumped)

cc-ci-secrets now encrypts to the new host (195.201.88.249) via its own
ssh-host-key-derived age identity, like the canonical cc-ci did, so the
off-box master recovery key no longer has to live on that box —
/var/lib/sops-nix/key.txt there holds the host-derived identity instead.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FqkQq3CDmFWcQ7u1LzoyRz

.sops.yaml

@@ -5,10 +5,12 @@
 #            /srv/cc-ci/.sops/master-age.txt (never in this repo). Lets us re-key if cc-ci is lost.
 keys:
   - &host   age1h90utdztfc23kx8ewrtrtk80mnddvrf8pg4ppej55rwwwupzhfvqhmp3qa
+  - &host2  age1tmvgpgc822ezqgxg4x8h6ndph6j9hwpgjpg364zn7lw3t5h694rq5730wa
   - &master age1cmk26t9e30ls8594s8txgmf2exenydmntfxqpcd3qdqm3ru2lpnqpdkdz9
 creation_rules:
   - path_regex: secrets/.*\.(yaml|json|env)$
     key_groups:
       - age:
           - *host
+          - *host2
           - *master