feat(changelog): containers-changed-serverless-containers-default-sandbo 2024-09-19 (#3727)

Author: ofranc

changelog/september2024/2024-09-19-containers-changed-serverless-containers-default-sandbo.mdx

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+---
+title: Serverless Containers default sandbox set to v2
+status: changed
+author:
+    fullname: 'Join the #serverless-containers channel on Slack.'
+    url: 'https://slack.scaleway.com'
+date: 2024-09-19
+category: serverless
+product: containers
+---
+
+To reduce cold-starts, we recently added a new version of our sandbox: v2.
+
+This is now the default sandbox version for new Functions on the console, as it offers enhanced performance.
+