chore(deps): update dependency @apollo/subgraph to v2.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@apollo/subgraph	2.14.4 → 2.15.0

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Release Notes

apollographql/subgraph-js (@​apollo/subgraph)

v2.15.0

Compare Source

This release is a generic reimplementation of @apollo/subgraph
that can be used with any graphql-js compatible subgraphs. Unless
otherwise noted, behavior is intended to stay compatible with the
previous implementation.

Changed

• Use graphql-js functionality over custom logic. All logic is now
  re-implemented using graphql-js functionality. @apollo/federation-internals is no
  longer a dependency.
• printSubgraphSchema now prints the complete schema, federation
  directives, types, and root fields included. NOTE: It is just a thin wrapper around
  @graphql-tools/utils's printSchemaWithDirectives.

Removed

• LegacySchemaModule input shape. buildSubgraphSchema no longer accepts
  Apollo Server's old { typeDefs, resolvers } object shape. Pass an array of
  { typeDefs, resolvers } modules (or a bare DocumentNode) instead:

  - buildSubgraphSchema({ typeDefs, resolvers })
  + buildSubgraphSchema([{ typeDefs, resolvers }])

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