fix(ingestion): Fix mypy error stateful committable & restore mypy version.

[rslanka]

Fixes the following mypy error and restores the mypy version back.

src/datahub/ingestion/api/committable.py:42: error: Cannot override final attribute "__match_args__" (previously declared in base class "_StatefulCommittableConcrete")
src/datahub/ingestion/api/committable.py:42: error: Cannot override writable attribute "__match_args__" with a final one
src/datahub/ingestion/api/committable.py:42: error: Definition of "__match_args__" in base class "_CommittableConcrete" is incompatible with definition in base class "_StatefulCommittableConcrete"

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)

[github-actions]

Unit Test Results (build & test)

  92 files  ±0    92 suites  ±0   18m 5s ⏱️ - 2m 1s
672 tests ±0  613 ✔️ ±0  59 💤 ±0  0 ❌ ±0 

Results for commit 8b7d05c. ± Comparison against base commit 1198123.

[github-actions]

Unit Test Results (metadata ingestion)

       5 files  ±0         5 suites  ±0   48m 55s ⏱️ + 1m 45s
   362 tests ±0     362 ✔️ ±0    0 💤 ±0  0 ❌ ±0 
1 657 runs  ±0  1 626 ✔️ ±0  31 💤 ±0  0 ❌ ±0 

Results for commit 8b7d05c. ± Comparison against base commit 1198123.

[shirshanka]

LGTM