Conform to new linting rules

[IgorTatarnikov]

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Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
Linting is failing in #96 due to instance checks being flagged as an error now.

What does this PR do?
Fixes the linting error.

References

How has this PR been tested?

Linting passes with the new ruff version, all tests pass, and visual inspection confirms the function still returns the correct subset of layer types.

Is this a breaking change?

No

Does this PR require an update to the documentation?

No

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.72%. Comparing base (6044656) to head (e7d448b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #97   +/-   ##
=======================================
  Coverage   92.72%   92.72%           
=======================================
  Files          37       37           
  Lines        1855     1855           
=======================================
  Hits         1720     1720           
  Misses        135      135           

Flag	Coverage Δ
numba	92.66% <ø> (ø)

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