fix: contributors

Co-authored-by: Bartlomiej Plotka <bwplotka@gmail.com>
Signed-off-by: Manik Rana <Manikrana54@gmail.com>

Author: Maniktherana

proposals/2024-12-14_update-created-timestamps-for-openmetrics-text.md

@@ -2,6 +2,8 @@
 
 * **Owners:**
     * Manik Rana [@Maniktherana](https://github.com/Maniktherana)
+
+**Contributors:**
     * Arthur Silva Sens [@ArthurSens](https://github.com/ArthurSens)
     * Bartłomiej Płotka [@bwplotka](https://github.com/bwplotka)