Adding Enrichment v4.1.1 release notes

OLIDS/Release-notes/3_OLIDS_Enrichment/v4.1.1.md

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+> [!NOTE]
+> The below is a summary of the changes since the previous release [v4.1.0](https://github.com/NHSISL/LondonDataservices.Transform.OLIDS_Enrichment/releases/tag/releases%2Fv4.1.0).
+## Summary
+
+This release delivers an important update to data masking controls and addresses a compatibility issue in the pipeline dependencies. The new masking entries enhance patient data protection, while the dependency fix ensures stable pipeline operation by avoiding issues with the latest SQLAlchemy version. These changes improve both data security and system reliability.
+
+### Improvements
+- Update masking_control_data to add entries on BIRTH_WEEK_ISO and BIRTH_DAY for PC_TPP_PATIENT. *[PR: [#101](https://github.com/NHSISL/LondonDataservices.Transform.OLIDS_Enrichment/pull/101)]*
+  > 🎯 ***Impact:*** Expands data masking coverage to additional patient date fields, strengthening data privacy controls.
+
+### Bug Fixes
+- Pin SQLAlchemy to earlier versions to avoid incompatibility in the pipeline. *[PR: [#110](https://github.com/NHSISL/LondonDataservices.Transform.OLIDS_Enrichment/pull/110)]*
+  > 🐞 ***Fix:*** Prevents pipeline failures caused by breaking changes in the latest SQLAlchemy release, ensuring stable operation.
+
+### Inputs
+
+This changelog was automatically produced from:
+
+- 2 Pull Requests
+- 0 Issues
+- 0 WorkItems
+- 5 Commits
+
+## Full Details
+
+Pull Requests included in this release:
+- [PR #101](https://github.com/NHSISL/LondonDataservices.Transform.OLIDS_Enrichment/pull/101): Update masking_control_data.sql
+  - No linked issues.
+- [PR #110](https://github.com/NHSISL/LondonDataservices.Transform.OLIDS_Enrichment/pull/110): Pipeline SQL Alchemy fix
+  - No linked issues.
+
+[View the diff between v4.1.0 and v4.1.1](https://github.com/NHSISL/LondonDataservices.Transform.OLIDS_Enrichment/compare/releases%2Fv4.1.0...releases%2Fv4.1.1)