My Jetpack: Fix gap between product cards

[renatoagds]

Fixing the gap between the ProductCard components into ProductCardsSection

Changes proposed in this Pull Request:

• Update horizontalSpacing and horizontalGap in ProductCardsSection.

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

• Build My Jetpack (jetpack build packages/my-jetpack)
• Open My Jetpack page.
• Check the gap between the ProductCard components

[github-actions]

Thank you for your PR!

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[retrofox]

LGTM

before

after

LGTM 🚀