Use new Date() in log function in automatically-redelivering-failed-deliveries-for-a-repository-webhook.md

[mcdurdin]

Why:

new Date(value) returns value as a date, whereas Date(value) returns now as a date.

What's being changed (if available, include any code snippets, screenshots, or gifs):

One word change.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Source	Review	Production	What Changed
webhooks/using-webhooks/automatically-redelivering-failed-deliveries-for-a-repository-webhook.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

@mcdurdin I'm checking with the appropriate team to make sure you're not encountering a bug, and I'll let you know what they tell me.

[github-actions]

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