[DX-1726] Gateway release notes 5.3.8

[Eopayemi]

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DX-1726

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Description

Gateway release notes for 5.3.8

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• I have added a preview link to the PR description.
• I have reviewed the suggestions made by our AI (PR Agent) and updated them accordingly (spelling errors, rephrasing, etc.)
• I have reviewed the guidelines for contributing to this repository.
• I have read the technical guidelines for contributing to this repository.
• Make sure you have started your change off our latest master.
• I labeled the PR

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PR Type

Documentation

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Description

• Added detailed release notes for Tyk Gateway version 5.3.8, focusing on bug fixes.
• Included compatibility matrix for Tyk components and third-party dependencies.
• Provided upgrade instructions and download links for the new release.
• Added a template for the changelog with sections for added features and fixed issues.

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Relevant files

Documentation

version-5.3.md Add release notes and changelog for Tyk Gateway 5.3.8        tyk-docs/content/product-stack/tyk-gateway/release-notes/version-5.3.md Added release notes for version 5.3.8. Included sections for release highlights, breaking changes, deprecations, and upgrade instructions. Added compatibility matrix and third-party dependencies information. Provided download links and changelog template. +114/-1

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✅ PS. Pls add /docs/nightly to the end of url

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