Update dependency @octokit/graphql-schema to v15.16.0

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@octokit/graphql-schema	15.15.0 -> 15.16.0

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Release Notes

octokit/graphql-schema (@​octokit/graphql-schema)

v15.16.0

Compare Source

Features

• Environment#{isPinned,latestCompletedDeployment,pinnedPosition}, mutations: pinEnvironment(), reorderEnvironment() (#​946) (5b662f5)

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