Fix shellcheck binary urls

[jimmykarily]

because linting now is broken in CI

Reason: koalaman/shellcheck#1871

Urls from here: https://github.com/koalaman/shellcheck/releases/tag/v0.7.0

Description

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code has security implications.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[jimmykarily]

Comment in the index page of the original location explains:

 Warning: These builds are deprecated and may be removed in the near future. Get them from GitHub Release instead.

See here: https://storage.googleapis.com/shellcheck/index.html