fix: relax dotenv dependency

[dvilelaf]

Proposed changes

• Bumps dotenv package

Fixes

n/a

Types of changes

What types of changes does your code introduce to agents-aea?
Put an x in the boxes that apply

• 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

Put an x in the boxes that apply.

• 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

Further comments

n/a

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.26%. Comparing base (af1336f) to head (75d6d8b).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #721      +/-   ##
==========================================
+ Coverage   90.25%   90.26%   +0.01%     
==========================================
  Files         373      373              
  Lines       29854    29854              
==========================================
+ Hits        26945    26948       +3     
+ Misses       2909     2906       -3     

Flag	Coverage Δ
unittests	90.26% <ø> (+0.01%)	⬆️

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