Update problem statuses and last update dates

Author: teorth

data/problems.yaml

@@ -10606,8 +10606,8 @@
 - number: "960"
   prize: "no"
   status:
-    state: "open"
-    last_update: "2025-08-31"
+    state: "disproved"
+    last_update: "2026-04-09"
   oeis: ["possible"]
   formalized:
     state: "no"
@@ -12053,8 +12053,8 @@
 - number: "1091"
   prize: "no"
   status:
-    state: "open"
-    last_update: "2025-10-17"
+    state: "solved"
+    last_update: "2026-04-09"
   formalized:
     state: "no"
     last_update: "2025-09-28"
@@ -12605,8 +12605,8 @@
 - number: "1141"
   prize: "no"
   status:
-    state: "open"
-    last_update: "2026-01-23"
+    state: "disproved"
+    last_update: "2026-04-09"
   formalized:
     state: "yes"
     last_update: "2026-02-11"