[CT-2975] Fix untyped functions in adapters/base/meta.py (mypy warning)

[emmyoop]

Problem

When we hit a mypy error the console is flooded with mypy warnings as well. Clean up the warning to improve developer experience.

Reproduction

Simply force a mypy error (change types) and the warnings will be generated.

Relevant Output

core/dbt/adapters/base/meta.py:109: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
core/dbt/adapters/base/meta.py:110: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]

[gshank]

Fixed by #8523