C0: update ringtail flake inputs (nixpkgs, disko)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/changelog.d/+ringtail-flake-update-2026-06-01.infra.md

@@ -0,0 +1,4 @@
+Update the ringtail NixOS flake lockfile (`nixos/ringtail/flake.lock`): bump
+`nixpkgs` (b77b3de → 25f5383) and `disko` (5ba0c95 → 115e521) to latest.
+`nixpkgs-services` was intentionally left pinned (skipped by the
+`flake-update` pipeline). Routine recurring maintenance per [[manage-lockfile]].

nixos/ringtail/flake.lock

@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1779699611,
-        "narHash": "sha256-EcCaSTKnmg2o4wLKaN1aqQFomwyhO7ik0bX9COdyCas=",
+        "lastModified": 1780290312,
+        "narHash": "sha256-eTAlX0CwgB84Ts3GaBd944A3DRXVMzgA0EqroZBISUo=",
         "owner": "nix-community",
         "repo": "disko",
-        "rev": "5ba0c9555c28685e57fa54c7a25e42c7efdbfc8d",
+        "rev": "115e5211780054d8a890b41f0b7734cafad54dfe",
         "type": "github"
       },
       "original": {
@@ -43,11 +43,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1779467186,
-        "narHash": "sha256-nOesoDCiXcUftqbRBMz9tt4blI5PvljMWbm3kuCA+0s=",
+        "lastModified": 1779796641,
+        "narHash": "sha256-ZsIrKmhp4vbBXoXXmR/tBXA/UCsAQiJL9vsgZEduhVY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b77b3de8775677f84492abe84635f87b0e153f0f",
+        "rev": "25f538306313eae3927264466c70d7001dcea1df",
         "type": "github"
       },
       "original": {