Fix IPFS plugin imports

[angrybayblade]

Proposed changes

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Fixes

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Types of changes

What types of changes does your code introduce to agents-aea?
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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Lint and unit tests pass locally with my changes and CI passes too
• I have added tests that prove my fix is effective or that my feature works
• I have checked that code coverage does not decrease.
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (e3d2da4) 91.82% compared to head (12468d9) 90.25%.

Files	Patch %	Lines
aea/package_manager/base.py	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #698      +/-   ##
==========================================
- Coverage   91.82%   90.25%   -1.58%     
==========================================
  Files         371      371              
  Lines       29775    29780       +5     
==========================================
- Hits        27340    26877     -463     
- Misses       2435     2903     +468     

Flag	Coverage Δ
unittests	90.25% <76.92%> (-1.58%)	⬇️

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[solarw]

lgtm