fix(cli): Bumping avro-gen3 to 0.7.4

[jjoyce0510]

In this PR we bump to the latest avro-gen3 library for metadata-ingestion framework. This will enable us to move forward in actions framework without breaking on backwards compatible schema changes.

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[github-actions]

Unit Test Results (build & test)

339 tests  ±0   339 ✔️ ±0   3m 8s ⏱️ +2s
  82 suites ±0       0 💤 ±0 
  82 files   ±0       0 ❌ ±0 

Results for commit 13a1df5. ± Comparison against base commit e567d70.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Results (metadata ingestion)

       3 files         3 suites   58m 51s ⏱️
   489 tests    452 ✔️   36 💤 1 ❌
1 413 runs  1 308 ✔️ 104 💤 1 ❌

For more details on these failures, see this check.

Results for commit 13a1df5.

♻️ This comment has been updated with latest results.

[shirshanka]

LGTM