docs: Add Rapid7 to the list of Karpenter adopters (#4852)

Signed-off-by: snorlaX-sleeps <[email protected]>

ADOPTERS.md

@@ -38,6 +38,7 @@ If you are open to others contacting you about your use of Karpenter on Slack, a
 | PITS Global Data Recovery Services | Used to manage continuous integration and continuous delivery/deployment workflows. | N/A | [PITS Global Data Recovery Services](https://www.pitsdatarecovery.net/) |
 | PlanetScale | Leveraging Karpenter to dynamically deploy serverless MySQL workloads. | `@jtcunning` | [Homepage](https://www.planetscale.com/) |
 | QuestDB | Using Karpenter for the service nodes of the QuestBD Cloud (time-series database). | [questdb slack group](https://slack.questdb.io/) | [QuestDB](https://questdb.io/) |
+| Rapid7 | Using Karpenter across all of our Kubernetes infrastructure for efficient autoscaling, both in terms of speed and cost | `@arobinson`, `@Ross Kirk`, `@Ryan Williams` | [Homepage](https://www.rapid7.com/) |
 | Sendcloud | Using Karpenter to scale our k8s clusters for Europe’s #1 shipping automation platform  | N/A | [Homepage](https://www.sendcloud.com/) |
 | Sentra | Using Karpenter to scale our EKS clusters, running our platform and workflows while maximizing cost-efficiency with minimal operational overhead | `@Roei Jacobovich` | [Homepage](https://sentra.io/) |
 | Stone Pagamentos | Using Karpenter to do smart sizing of our clusters  | `@fabiano-amaral` | [Stone Pagamentos](https://www.stone.com.br/) |