fix(deps): update apollo graphql packages to ^2.18.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
apollo-server-express	dependencies	patch	^2.18.1 -> ^2.18.2
apollo-server-micro	dependencies	patch	^2.18.1 -> ^2.18.2

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Release Notes

apollographql/apollo-server

v2.18.2

Compare Source

• apollo-server-core: Explicitly include lru-cache dependency in apollo-server-core's dependencies. PR #​4600

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[timleslie]

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