Relax activesupport dependency for rails 5

[OAbubakr]

Problem:

Gem was not compatible with rails 5.4

Solution:

Relaxing gem version dependency

Notes:

Check usage of gem with rails 5.4 and it works fine.

QC Notes:

TODO: What parts/flows of the app are affected by this change?

Release steps:

TODO: steps needed for the release. If no special handling needed, please write 'Normal Release'

Security:

TODO: Are the changes exposed publicly or internally?

TODO: Do all new endpoints impose proper access to authorized users only?

Network:

TODO: Link to Ops PR if any. Type N/A if none.

TODO: List new internal/external services communications that were introduced in this PR. Type N/A if none.

Author checklist:

• Backward compatibility checked
• Release steps added
• Unit tests added (if code logic is touched)
• JIRA ticket moved to Reviewing
• Rebased to latest master
• Commits are clean

Reviewer checklist:

• Backward compatibility checked
• Code quality is acceptable
• Specs logic coverage
• Commits are clean

[ahmedakef]

the commit is copied in: https://github.com/Instabug/google-api-ruby-client/pull/3/commits