Use relative path for index generator dependency

[michael-valdron]

Please specify the area for this PR

index server
registry library

What does does this PR do / why we need it:

Uses the relative path to reference github.com/devfile/registry-support/index/generator dependency to ensure release changes are in sync and release reference is set beforehand.

Which issue(s) this PR fixes:

Fixes #?

PR acceptance criteria:

• Test Coverage
  • Are your changes sufficiently tested, and are any applicable test cases added or updated to cover your changes?

Documentation (WIP)

• Does the REST API doc need to be updated with your changes?
• Does the registry library doc need to be updated with your changes?

How to test changes / Special notes to the reviewer:

[openshift-ci]

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This pull-request has been approved by: michael-valdron
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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (0907df8) 35.93% compared to head (fbf72c8) 35.93%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #184   +/-   ##
=======================================
  Coverage   35.93%   35.93%           
=======================================
  Files           7        7           
  Lines        1347     1347           
=======================================
  Hits          484      484           
  Misses        816      816           
  Partials       47       47           

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[openshift-merge-robot]

PR needs rebase.

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[michael-valdron]

Stale changes, done in #190.