Relax python-dotenv dependency

[evangriffiths]

Proposed changes

Relax python-dotenv dependency. The only use of the package in open-aea is here https://github.com/valory-xyz/open-aea/blob/main/aea/helpers/base.py#L144. This is compatible with the newest release of python-dotenv.

Types of changes

No functional changes. Dependency change only.

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

[angrybayblade]

@evangriffiths Can you take a look at the failure and see if it has anything to do with the changes you made?

[angrybayblade]

@evangriffiths Can you sync your PR with main? I've merged the fix for the CI failure

[evangriffiths]

I've merged the fix for the CI failure

@angrybayblade Thanks! Synced.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.06%. Comparing base (9d887d6) to head (3229a1c).
Report is 44 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #740      +/-   ##
==========================================
- Coverage   90.21%   90.06%   -0.16%     
==========================================
  Files         373      373              
  Lines       29899    29971      +72     
==========================================
+ Hits        26974    26994      +20     
- Misses       2925     2977      +52     

Flag	Coverage Δ
unittests	90.06% <ø> (-0.16%)	⬇️

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