fix the application timeline information

[fykaa]

Why:

the docs has incorrect information about the program application timelines, you can find the accurate info here:
Authentic source 1: https://education.github.com/campus_experts
Authentic source 2: https://github.com/campus-experts/.github/blob/master/profile/README.md?plain=1#L19

Closes:

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

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.

[Copilot]

Pull Request Overview

This pull request corrects the application timeline information for the GitHub Campus Expert program. The PR updates the documentation to reflect the accurate application schedule based on authoritative sources.

• Updates application timing from "February and August" to "every July"

[github-actions]

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Source	Review	Production	What Changed
education/about-github-education/use-github-at-your-educational-institution/applying-to-be-a-github-campus-expert.md	fpt	fpt

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

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[Sharra-writes]

@fykaa Thanks for opening a PR for these fixes! Some of our checks are a little off-the-rails at the moment, so I'll get this merged once we get them fixed. Sorry about the delay!

[github-actions]

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