chore: Update dependency @cloudflare/workers-types to v4.20230518.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@cloudflare/workers-types	4.20230511.0 -> 4.20230518.0

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Release Notes

cloudflare/workerd

### [`v4.20230518.0`](https://togithub.com/cloudflare/workerd/compare/8f4274db3823772dc86fade66c631775405dca30...2d124ecd2d1132537d37bd5e166ac1aec4f7397f) [Compare Source](https://togithub.com/cloudflare/workerd/compare/8f4274db3823772dc86fade66c631775405dca30...2d124ecd2d1132537d37bd5e166ac1aec4f7397f)

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Configuration

📅 Schedule: Branch creation - "before 3am on Monday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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[codecov[bot]]

Codecov Report

Merging #14 (e14ab2b) into main (4bffd83) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #14   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines          111       111           
  Branches        26        26           
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  Hits           111       111