Update braintree requirement from ~> 3.0.0 to ~> 4.3.0

[dependabot-preview]

Updates the requirements on braintree to permit the latest version.

Changelog

Sourced from braintree's changelog.

4.3.0

• Add a log message to the ArgumentError at TransactionGateway.find
• Add exchange_rate_quote_id to Transaction.create
• Add error code ExchangeRateQuoteIdTooLong to Transaction
• Add the following fields to ApplePayCard and GooglePayCard:
  • commercial
  • debit
  • durbin_regulated
  • healthcare
  • payroll
  • prepaid
  • product_id
  • country_of_issuance
  • issuing_bank
• Add the following fields to PayPalDetails:
  • tax_id
  • tax_id_type

4.2.0

• Add default? to PaymentMethodNonce (thanks @​klouvas)
• Add error code TaxAmountIsRequiredForAibSwedish for attribute tax_amount in transaction key for AIB:Domestic Transactions in Sweden

4.1.0

• Add payment_reader_card_details parameter to Transaction.sale
• Add webhook sample for GrantedPaymentMethodRevoked
• Add skip_advanced_fraud_checking to:
  • Customer#create and Customer#update
  • PaymentMethod#create and PaymentMethod#update
  • CreditCard#create and CreditCard#update
• Include rexml in Gemspec (fixes #214)
• Fix incorrect error code constants (fixes #213)
  • PaymentMethodNonceConsumed is now 93107
  • CannotForwardPaymentMethodType is now 93106

4.0.0

• Breaking Changes
  • Update gemspec to require ruby >= 2.6.0
  • Remove ExternalVault::CardTypeIsInvalid error code
  • Remove RiskData::CustomerBrowserIsTooLong error code
  • Remove paypal_vault_without_upgrade parameter from PaymentMethod#create
  • Add PaymentMethodNonceDetails and PaymentMethodNonceDetailsPayerInfo
    • PaymentMethodNonce#details is now an instance of PaymentMethodNonceDetails rather than a hash
    • PaymentMethodNonceDetails#payer_info is now an instance of PaymentMethodNonceDetailsPayerInfo rather than a hash
• Add phone_number to Address
• Add paypal_messages to Dispute
• Add tax_identifiers parameter to Customer.create and Customer.update
• Add chargeback_protection_level into dispute search
• Make libxml-ruby an optional dependency instead of required (addresses JRuby incompatibility issues raised in #203 and #205)

3.4.0

... (truncated)

Commits

• 375df2b 4.3.0
• 87cc755 Fixed merge conflicts
• cba87ff Merge branch 'master' of github.com:braintree/braintree_ruby into github_master
• a2ae338 Update CHANGELOG.md
• 7525231 Merge remote-tracking branch 'github/master' into github_master
• 82c42d8 Merge pull request #217 from BrianLima/fix/improve-agument-error-on-find-id-i...
• f9ddadf Describe ArgumentError when id is nil or empty
• 39d3e24 4.2.0
• 954e045 4.1.0
• fa97438 4.0.0
• Additional commits viewable in compare view

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