Global Styles: Add colors to Shipping method prices

[tarunvijwani]

Describe the bug

Shipping method prices have fixed color that may be unreadable on some background colors.

To reproduce

Steps to reproduce the behavior:

1. Install and activate a block theme, e.g. Twenty Twenty-Three.
2. Create a test page with the Checkout block.
3. Create a test page with the Cart block.
4. Go to WP Admin » Apperance » Editor.
5. Open the Styles sidebar.
6. Adjust all Color settings.
7. Notice shipping method price color didn't change.

Expected behavior

Global styles should allow option to change shipping method price color

Screenshots