Update ct flake input

flake.lock

@@ -60,11 +60,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1793363317,
-        "narHash": "sha256-qi05Pa9vUO+81kx8xJQtEQZXF0Q4+JzpjiFL7X4n+7c=",
+        "lastModified": 1793616777,
+        "narHash": "sha256-JBTAOCuZc2t0NJMB035KkXAsHYiFlB31LZHOJXYkqWY=",
         "ref": "main",
-        "rev": "0ef57d30eaefcca01465adb36bf037c22f38e7f7",
-        "revCount": 15,
+        "rev": "6f21c78edc02918e6144e35bdc4b1f13131be50b",
+        "revCount": 20,
         "type": "git",
         "url": "ssh://gitea@git.ppp.pm:1122/alex/ct.git"
       },