chore: update golangci-lint to v2.13.0

Migrate the deprecated gofumpt `extra-rules` to `extra.group-params`, as
the alias now also enables the new `clothe-returns` and `balance-calls`
rules. Disable SA4023, which hangs on go 1.27, see
https://github.com/golangci/golangci-lint/issues/6732.

Apply the resulting modernize fixes, mostly flattening embedded struct
literals and switching errors.As to errors.AsType.

Assisted-by: Claude:Opus 5

modules/setting/cache.go

@@ -25,11 +25,9 @@ var CacheService = struct {
 		TTL time.Duration `ini:"ITEM_TTL"`
 	} `ini:"cache.last_commit"`
 }{
-	Cache: Cache{
-		Adapter:  "memory",
-		Interval: 60,
-		TTL:      16 * time.Hour,
-	},
+	Adapter:  "memory",
+	Interval: 60,
+	TTL:      16 * time.Hour,
 	LastCommit: struct {
 		TTL time.Duration `ini:"ITEM_TTL"`
 	}{