fix(deps): update dependency stripe/stripe-php to v13.18.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stripe/stripe-php (source)	13.17.0 -> 13.18.0

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Release Notes

stripe/stripe-php (stripe/stripe-php)

v13.18.0

Compare Source

• #​1675 Update generated code
  • Add support for new resources Entitlements.ActiveEntitlement and Entitlements.Feature
  • Add support for all and retrieve methods on resource ActiveEntitlement
  • Add support for all, create, retrieve, and update methods on resource Feature
  • Add support for new value none on enum Account.type
  • Add support for cancel, event_name, and type on Billing.MeterEventAdjustment

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