remove deprecated lint.files

deno.jsonc

@@ -12,15 +12,20 @@
     "test": "deno test ./test/test.ts"
   },
   "lint": {
-    "files": {
-      "include": ["src/"]
-    },
+    "include": [
+      "src/"
+    ],
     "rules": {
-      "tags": ["recommended"]
+      "tags": [
+        "recommended"
+      ]
     }
   },
   "fmt": {
-    "include": ["src/", "test/"],
+    "include": [
+      "src/",
+      "test/"
+    ],
     "useTabs": false,
     "lineWidth": 80,
     "indentWidth": 2,