Upgrade to 15.5

[SerafimArts]

Changes to the specification

• Added InterfacesAwareInterface into InterfaceTypeInterface
  • Added method InterfaceTypeInterface::getInterface(string): ?InterfaceTypeInterface
  • Added method InterfaceTypeInterface::hasInterface(string): bool
  • Added method InterfaceTypeInterface::getInterfaces(): iterable<string, InterfaceTypeInterface>
• Added specifiedByUrl(): ?string method into ScalarTypeInterface (see [RFC] Custom Scalar Specification URIs graphql/graphql-spec#635)
• Method DeprecationAwareInterface::isDeprecated() marked as deprecated (will be removed in 16.*)
• Method SchemaInterface::isPossibleType(AbstractTypeInterface, ObjectTypeInterface): bool marked as deprecated (will be removed in 16.*)
• Added SchemaInterface::isSubType(AbstractTypeInterface, ObjectTypeInterface|InterfaceTypeInterface): bool method
• Added SchemaInterface::getImplementations(InterfaceTypeInterface): iterable<ObjectTypeInterface|InterfaceTypeInterface> method
• Added DescriptionAwareInterface into SchemaInterface
  • Added method SchemaInterface::getDescription(): ?string
• Added DeprecationAwareInterface into ArgumentInterface
  • Added method ArgumentInterface::getDeprecationReason(): ?string
• Added DeprecationAwareInterface into InputFieldInterface
  • Added method InputFieldInterface::getDeprecationReason(): ?string

Other Improvements

• vimeo/psalm dependecy has been actualized
• sensiolabs/security-checker dependency has been replaced to roave/security-advisories