Update 2023-oss-na.md

[patricia-cahill]

Addition of the TAG related talks during KubeCon NA

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[guidemetothemoon]

@patricia-cahill I think we need to create a separate article that will contain talks for the KubeCon + CloudNativeCon NA. The one you updated was for Open Source Summit NA event which happened back in May so we need to create a dedicated article to avoid confusion. Would you be able to do that, please?😊

[leonardpahlke]

Yes, we need to create a new file. Here: https://github.com/cncf/tag-env-sustainability/tree/main/website/content/events

[nikimanoledaki]

Could we add the following talks as well, please - thank you @patricia-cahill! 🙌

[Cutting Climate Costs with Kubernetes and CAPI - Shiva Rezaie & Steve Francis, Sidero Labs](https://sched.co/1R2p6)

[Sponsored Keynote: Reduce, Reuse, Recycle - Nathan Taber, Head of Product, Kubernetes, Amazon Web Services](https://sched.co/1R4fu)

[Kube-Costbusters: Optimizing Kubernetes Clusters for Efficiency and Epic Savings! - Rachel Leekin & Antoinette Mills, AWS](https://sched.co/1R2r2)

[Where's Your Money Going? the Beginners Guide to Measuring Kubernetes Costs - Mark Poko & JuanJo Ciarlante, Grafana Labs](https://sched.co/1R2vE)