Upgrade to grahql-java 15.0

[marceloverdijk]

graphql-java-tools is not compatible with latest graphql-java 15.0.

graphql-java-tools/src/main/kotlin/graphql/kickstart/tools/TypeClassMatcher.kt

Line 87 in e4690db

val typeDefinition = ScalarInfo.STANDARD_SCALAR_DEFINITIONS[graphQLType.name]

ScalarInfo.STANDARD_SCALAR_DEFINITIONS does not exist in graphql-java 15.0 anymore.

[vojtapol]

graphql-java-tools defines dependency on the compatible version of graphql-java. Do not specify dependency on graphql-java separately to ensure everything works correctly.

[marceloverdijk]

I understand. For me this issue is mainly to track the upgrade to 15.0.