GithubRefs: fixup "my" variable $type masks earlier declaration in same scope

Dependencies

• [2] KIRRGSUC Add GithubRefs plugin
• [3] 7I2U2MHU perlcritic: use strict, use warnings

Change contents

• replacement in src/lib/Hydra/Plugin/GithubRefs.pm at line 100
  [2.3312]→[2.3312:3418](∅→∅)
  − my ($self, $type, $name, $value, $project, $jobset) = @_;

  − return undef if $type ne "github_refs";
  [2.3312]

  [2.3418]
  + my ($self, $input_type, $name, $value, $project, $jobset) = @_;

  + return undef if $input_type ne "github_refs";