Add 'core_version_requirement: ^8 || ^9'

[jmarkel]

The "GraphQL Examples" module cannot be enabled in Drupal 9 without adding the 'core_version_requirement:' stanza in graphql_examples.info.yml

[codecov]

Codecov Report

Merging #1050 into 8.x-4.x will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             8.x-4.x    #1050   +/-   ##
==========================================
  Coverage      50.38%   50.38%           
  Complexity       683      683           
==========================================
  Files            118      118           
  Lines           1820     1820           
==========================================
  Hits             917      917           
  Misses           903      903           

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[klausi]

Thanks, this was already fixed with #1074 .