Update version numbers for 7.5.3 release and 7.4.12

[Gijsreyn]

PR Summary

Update version numbers for 7.5.3 release and 7.4.12

• Fixes: I don't have the internal number

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributor's guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

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[Gijsreyn]

@sdwheeler - up for grabs! :)

[github-actions]

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[learn-build-service-prod]

Learn Build status updates of commit 6685e3e:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/install/community-support.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/install/install-alpine.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/install/install-debian.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/install/install-other-linux.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/install/install-rhel.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/install/install-ubuntu.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/install/Installing-PowerShell-on-macOS.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/install/Installing-PowerShell-on-Windows.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

[sdwheeler]

@Gijsreyn Thanks for the updates!