Update dependency graphql-tag to v2.12.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
graphql-tag	2.9.2 -> 2.12.6

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Release Notes

apollographql/graphql-tag (graphql-tag)

v2.12.6

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• Update peer dependencies to allow graphql ^16.0.0.
  
  @​brainkim in #​530

v2.12.5

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• Also publish src/ directory to npm, enabling source maps.
  
  @​maclockard in #​403

v2.12.4

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• Allow fragments to be imported by name when using the webpack loader.
  
  @​dobesv in #​257

v2.12.3

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• Update tslib dependency to version 2.1.0.
  
  @​benjamn in #​381

v2.12.2

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• Avoid using Object.assign to attach extra properties to gql.
  
  @​benjamn in #​380

v2.12.1

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• To accommodate older versions of TypeScript, usage of the import type ... syntax (introduced by #​325) has been removed, fixing issue #​345.
  
  @​benjamn in #​352

v2.12.0

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• The graphql-tag repository has been converted to TypeScript, adding type safety and enabling both ECMAScript and CommonJS module exports. While these changes are intended to be as backwards-compatible as possible, we decided to bump the minor version to reflect the significant refactoring.
  
  @​PowerKiKi and @​benjamn in #​325

v2.11.0

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• package.json sideEffects changes to clearly identify that graphql-tag doesn't have side effects.
  
  @​hwillson in #​313

v2.10.4

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• Bump dev/peer deps to accommodate graphql 15.
  
  @​adriencohen in #​299

v2.10.3

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• Further adjustments to the TS index.d.ts declaration file.
  
  @​Guillaumez in #​289

v2.10.2

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• Update/fix the existing TS index.d.ts declaration file.
  
  @​hwillson in #​285

v2.10.1

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• Fix failures in IE11 by avoiding unsupported (by IE11) constructor arguments to Set by rocwang in #​190

v2.10.0

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• Add support for graphql@14 by timsuchanek in #​210, #​211

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