update release notes to include changes from: https://github.com/ArcadeAI/tools/pull/15

Author: sg-doc-holiday[bot]

docs/release-notes/release-notes/c70c9c88d19c65b3b9756ce3e01cee80b56ec720.md

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+Release Title: Configure Salesforce subdomain & max concurrency through secrets
+
+Release Date: July 31, 2025
+
+### Breaking Changes
+- Upgraded `arcade_salesforce` package from **v1.0.0** to **v2.0.0**, introducing changes to the client initialization API. Existing integrations must update their dependency and initialization code accordingly.
+
+### New Features
+- 🚀 Support for configuring the Salesforce **subdomain** via secrets or environment variables, with validation and error handling when the value is missing.
+- 🚀 Support for configuring **max concurrency** for Salesforce requests through secrets or environment variables, including a sensible default when unset.