chore: update static-typing.md to add "graphql" as install dependency

[langarus]

The graphql package is required by the generated files and thus should be included in the initial suggested packages to be installed.

[apollo-cla]

@langarus: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

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[alessbell]

@langarus can you please sign the CLA? Once you have I can get this merged, thanks!

[langarus]

@langarus can you please sign the CLA? Once you have I can get this merged, thanks!

thank you, just signed it!

[phryneas]

Merging it - thank you for the PR! :)