fix(deps): move @graphql-tools/delegate to dependencies

[arnaud-zg]

Hey, I just update the library graphql-middleware to the version 6.0.0. Since then I can't build my project anymore. I noticed that the library @graphql-tools/delegate is not installed on my side, that's because it's not referenced as a dependency.

node_modules/graphql-middleware/dist/types.d.ts:2:31 - error TS2307: Cannot find module '@graphql-tools/delegate' or its corresponding type declarations.

2 import { StitchingInfo } from '@graphql-tools/delegate';
                                ~~~~~~~~~~~~~~~~~~~~~~~~~
Found 1 error.

error Command failed with exit code 2.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command. 

How to reproduce?

I think i figure it out. Graphql-shield is still using an older version. If I use 4.0.0 of the middleware then it works.

Here is the reproduction repo if you want to try it out.
https://github.com/cernicc/temp

Source: #314 (comment)

[codecov]

Codecov Report

Merging #321 (7ae1b45) into master (8dca5b8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #321   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          164       164           
  Branches        30        30           
=========================================
  Hits           164       164           

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[github-actions]

🎉 This PR is included in version 6.0.1 🎉

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