Bump billing_version from 6.2.1 to 7.0.0 in /android

[dependabot[bot]]

Bumps billing_version from 6.2.1 to 7.0.0. Updates com.android.billingclient:billing from 6.2.1 to 7.0.0

Updates com.android.billingclient:billing-ktx from 6.2.1 to 7.0.0

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[jeroen1602]

@dependabot rebase

[dependabot[bot]]

Looks like these dependencies are up-to-date now, so this is no longer needed.