Update links

[wesinator]

HTTPS links

[msftclas]

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. We will now review your pull request.
Thanks,
Microsoft Pull Request Bot

[v-kents]

✅ Validation status: passed

File	Status	Preview URL	Details
sysinternals/downloads/sigcheck.md	✅Succeeded	View

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[v-kents]

✅ Validation status: passed

File	Status	Preview URL	Details
sysinternals/downloads/autoruns.md	✅Succeeded	View
sysinternals/downloads/sigcheck.md	✅Succeeded	View

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[v-kents]

✅ Validation status: passed

File	Status	Preview URL	Details
sysinternals/downloads/autoruns.md	✅Succeeded	View
sysinternals/downloads/sigcheck.md	✅Succeeded	View

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[lukekim]

Thanks!