GitHub actions theme check fix

[Jyrko]

PR Summary:

This problem fixes the Github Actions CI/CD problem described here (#3701).

Fixed the problem for internal development of the theme.

Why are these changes introduced?

to fix Github Actions CI/CD problem in order to pass tests.

What approach did you take?

1. Start with research (check the official theme-check repository )
2. Create a hypothesis (it may be related with the theme-check version, as v1 is outdated)
3. Execute the experiment (try to change theme-check version)
4. If it fails then refine the hypothesis (in this case it is not)

Other considerations

As the theme-check version was updated, then I needed to fix an error in header.liquid file in order tests to pass because of LiquidHTMLSyntaxError.

Decision log

#	Decision	Alternatives	Rationale	Downsides
1

Visual impact on existing themes

It will not

Testing steps/scenarios

• Step 1

Checklist

• Added PR summary for release notes
• Requested review from UX (Only for changes that are affecting the experience or perceivable visual details)
• Created a ticket for the help.shopify.com documentation team about updates to theme settings. (Internal-only task)
• Followed theme code principles
• Linted with Theme Check
• Tested on mobile
• Tested on multiple browsers
• Tested for accessibility

[Jyrko]

I have signed the CLA!

[graygilmore]

Thanks Jyrko! I've got another PR with some additional changes #3704 that we'll be using instead. Thanks for your contribution!