fix(deps): update dependency apollo-server to v2.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
apollo-server	2.19.2 -> 2.20.0

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Release Notes

apollographql/apollo-server

v2.20.0

Compare Source

• apollo-server: Previously, ApolloServer.stop() functioned like net.Server.close() in that it did not close idle connections or close active connections after a grace period. This meant that trying to await ApolloServer.stop() could hang indefinitely if there are open connections. Now, this method closes idle connections, and closes active connections after 10 seconds. The grace period can be adjusted by passing the new stopGracePeriodMillis option to new ApolloServer, or disabled by passing Infinity (though it will still close idle connections). Note that this only applies to the "batteries-included" ApolloServer in the apollo-server package with its own built-in Express and HTTP servers. PR #​4908 Issue #​4097
• apollo-server-core: When used with ApolloGateway, ApolloServer.stop now invokes ApolloGateway.stop. (This makes sense because ApolloServer already invokes ApolloGateway.load which is what starts the behavior stopped by ApolloGateway.stop.) Note that @apollo/gateway 0.23 will expect to be stopped in order for natural program shutdown to occur. PR #​4907 Issue #​4428
• apollo-server-core: Avoid instrumenting schemas for the old graphql-extensions library unless extensions are provided. PR #​4893 Issue #​4889
• apollo-server-plugin-response-cache@0.6.0: The shouldReadFromCache and shouldWriteToCache hooks were always documented as returning ValueOrPromise<boolean> (ie, that they could be either sync or async), but they actually only worked if they returned a bool. Now they can be either sync or async as intended. PR #​4890 Issue #​4886
• apollo-datasource-rest@0.10.0: The RESTDataSource.trace method is now protected instead of private to allow more control over logging and metrics. PR #​3940

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