[Workers] Add release note for v8 version 15.3 update

[mar-cf]

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[cloudflare-docs-bot]

Review

⚠️ 1 warning found in commit e8831ed.

👉 Fix in your agent 👈

Fix the following review findings in PR #33078 (https://github.com/cloudflare/cloudflare-docs/pull/33078).

Before making changes, review each finding and present a brief summary table:
- For each finding, state whether you agree, disagree, or need clarification
- If you disagree (e.g. the fix requires disproportionate effort for minimal benefit,
  or the finding is factually incorrect), explain why
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After triaging, follow this order:
1. Post a comment on this PR for any findings you are skipping, with the finding ID and your reasoning.
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---

## Conventions

### Warnings (1)

#### CV-beb0822eab0f · Description explains the work
- **File:** PR-level finding
- **Issue:** The PR description is completely empty, so there is no human-written explanation of what the PR does.
- **Fix:** Add a brief description of the change, e.g. noting that a release note entry for the Workers v8 version 15.3 update was added to the Workers release notes.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

_{No code review issues found.}

Conventions

Warnings (1)

File	Issue
PR	Description explains the work — The PR description is completely empty, so there is no human-written explanation of what the PR does. Fix: Add a brief description of the change, e.g. noting that a release note entry for the Workers v8 version 15.3 update was added to the Workers release notes.

Style Guide Review

_{No style-guide issues found.}

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/rebase	Rebases the PR branch against production. On conflict, attempts to resolve automatically using AI. Stops with an explanation if confidence is not high enough.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/release-notes/workers.yaml	@cloudflare/workers-docs, @GregBrimble, @WalshyDev, @aninibread, @cloudflare/deploy-config, @cloudflare/product-owners, @irvinebroque, @mikenomitch, @MattieTK

[cloudflare-workers-and-pages]

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[github-actions]

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