chore: Bump minimum version of wp-graphql-content-blocks to v4.2.0

[ashutoshgautams]

What

This PR updates the minimum required version of the WPGraphQL Content Blocks plugin from 4.1.0 to 4.2.0.

Why

Many of our recent contributions have been merged into the latest version of the WPGraphQL Content Blocks plugin. To ensure we can continue iterating on our codebase, it's important to update the minimum required version to the latest stable release (v4.2.0 at the time of writing).

Related Issue(s):

Closes #9

How

1. Updated the version used in our test environment (snapwp-helper/bin/install-plugins.sh, line 32) from v4.1.0 to v4.2.0.
2. Updated the minimum version check in the dependency check (snapwp-helper/src/Modules/GraphQL.php, line 125) from '4.1.0' to '4.2.0'.
3. Verified that all lints and tests continue to pass with the updated version.

Testing Instructions

1. Ensure the WPGraphQL Content Blocks plugin is installed and activated on your local development environment.
2. Run the test suite and ensure all tests pass.
3. Verify that the minimum version check in the GraphQL module is set to '4.2.0'.

Screenshots

Additional Info

Checklist

• I have read the Contribution Guidelines.
• My code is tested to the best of my abilities.
• My code passes all lints (PHPCS, PHPStan, ESLint, etc).
• My code has detailed inline documentation.
• I have added unit tests to verify the code works as intended.
• I have updated the project documentation accordingly.