update go.mod to v4

[vmanley]

Description

Update go.mod to v4

• Module declaration changed from:
  module github.com/integr8ly/grafana-operator
  to:
  module github.com/grafana-operator/grafana-operator/v4
• Relevant import entries updated to reflect change of module declaration

Relevant issues/tickets

Resolves Issue 562

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• This change requires a documentation update
• I have added tests that prove my fix is effective or that my feature works
• I have added a test case that will be used to verify my changes
• Verified independently on a cluster by reviewer

Verification steps

Verified by running the operator locally on CRC as described in the Develop section of documentation

[pb82]

verified locally, great work @vmanley 👍