fix(deps): update dependency graphql-tag to v2.12.5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
graphql-tag	2.12.4 -> 2.12.5

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Release Notes

apollographql/graphql-tag

### [`v2.12.5`](https://togithub.com/apollographql/graphql-tag/blob/master/CHANGELOG.md#v2125) [Compare Source](https://togithub.com/apollographql/graphql-tag/compare/v2.12.4...cd2f4d0ab46c515a6628a3bef5600534c7d1a7a0) - Also publish `src/` directory to npm, enabling source maps.
[@​maclockard](https://togithub.com/maclockard) in [#​403](https://togithub.com/apollographql/graphql-tag/pull/403)

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