fix(ingest): compat with mypy 0.981

[hsheth2]

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 (metadata ingestion)

       8 files         8 suites   59m 59s ⏱️
   718 tests    714 ✔️ 3 💤 1 ❌
1 438 runs  1 431 ✔️ 6 💤 1 ❌

For more details on these failures, see this check.

Results for commit 7d17178.

[github-actions]

Unit Test Results (build & test)

584 tests  ±0   580 ✔️ ±0   12m 55s ⏱️ +3s
143 suites ±0       4 💤 ±0 
143 files   ±0       0 ❌ ±0 

Results for commit 7d17178. ± Comparison against base commit 6092875.

[treff7es]

lgtm