Add update for Decimal

Also, update the list of champions (it has changed since 2021).

Author: jessealama

stage-1-proposals.md

@@ -53,7 +53,7 @@ Proposals follow [this process document](https://tc39.es/process-document/).
 | [OOM Fails Fast][oom]                                                                        | Mark Miller                                           | Mark Miller                                            | <sub>[December&nbsp;2019][oom-notes]</sub>                        |
 | [Array filtering][array-filtering]                                                           | Justin Ridgewell                                      | Justin Ridgewell                                       | <sub>[February&nbsp;2020][array-filtering-notes]</sub>            |
 | [Async initialization][async-init]                                                           | Bradley Farias                                        | Bradley Farias                                         | <sub>[February&nbsp;2020][async-init-notes]</sub>                 |
-| [Decimal][decimal]                                                                           | Daniel Ehrenberg<br />Andrew Paprocki                 | Philip Chimento<br />Andrew Paprocki<br />Jesse Alama  | <sub>[December&nbsp;2021][decimal-notes]</sub>                    |
+| [Decimal][decimal]                                                                           | Daniel Ehrenberg<br />Andrew Paprocki                 | Andrew Paprocki<br />Jesse Alama<br />Jirka Marsik  | <sub>[September&nbsp;2023][decimal-stage-1-update-and-discussion]</sub>                    |
 | [Preserve Host Virtualizability][virtualize]                    | Mark Miller<br />J.F. Paradis<br />Caridy Patiño<br />Dan Finley<br />Alan Schmitt | Mark Miller<br />J.F. Paradis<br />Caridy Patiño<br />Dan Finley<br />Alan Schmitt | <sub>[February&nbsp;2020][virtualize-notes]</sub> |
 | [Legacy reflection features for functions in JavaScript][legacy-reflection]                  | Mark Miller<br />Claude Pache<br />Jack Works         | Mark Miller<br />Claude Pache<br />Jack Works          | <sub>[February&nbsp;2020][legacy-reflection-notes]</sub>          |
 | [Cryptographically Secure Random Number Generation][csprng]                                  | Ron Buckton                                           | Ron Buckton                                            | <sub>[February&nbsp;2020][csprng-notes]</sub>                     |