chore: update sqlx offline cache

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/.sqlx/query-2d6607b3c38fe72b5663c32de58dacbabed4c5ae28101e3ae2694f96fd055a91.json

@@ -15,7 +15,7 @@
       ]
     },
     "nullable": [
-      false
+      true
     ]
   },
   "hash": "2d6607b3c38fe72b5663c32de58dacbabed4c5ae28101e3ae2694f96fd055a91"

backend/.sqlx/query-5a219a2532517869578c4504ff3153c43903f929ae5d62fbba12610f89c36d55.json

@@ -15,7 +15,7 @@
       ]
     },
     "nullable": [
-      true
+      null
     ]
   },
   "hash": "5a219a2532517869578c4504ff3153c43903f929ae5d62fbba12610f89c36d55"

backend/.sqlx/query-eba16eb819e2644284fb073c891706d78a6f24cb0e614d7d81ba1b643805bf06.json

@@ -15,7 +15,7 @@
       ]
     },
     "nullable": [
-      false
+      true
     ]
   },
   "hash": "eba16eb819e2644284fb073c891706d78a6f24cb0e614d7d81ba1b643805bf06"