Merge pull request #24463 from oleiman/dlib/noticket/fix-json-writer-…

…decimal

iceberg: fix decimal type json writer

src/v/iceberg/datatypes_json.cc

@@ -142,7 +142,7 @@ class rjson_visitor {
     void operator()(const iceberg::float_type&) { w.String("float"); }
     void operator()(const iceberg::double_type&) { w.String("double"); }
     void operator()(const iceberg::decimal_type& t) {
-        w.String("decimal({}, {})", t.precision, t.scale);
+        w.String(fmt::format("decimal({}, {})", t.precision, t.scale));
     }
     void operator()(const iceberg::date_type&) { w.String("date"); }
     void operator()(const iceberg::time_type&) { w.String("time"); }