Add disclaimer to environment file regarding conda-forge recipe

[epassaro]

Description

Just a comment in the environment file.

Motivation and context

Avoid breaking the conda-forge package.

How has this been tested?

• Testing pipeline.
• Other.

Does not require testing.

Examples

Type of change

• Bug fix.
• New feature.
• Breaking change.
• None of the above.

Checklist

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • (optional) I have built the documentation on my fork following the instructions.
• I have assigned and requested two reviewers for this pull request.

[codecov]

Codecov Report

Merging #1974 (e3bc29b) into master (b54dc86) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1974   +/-   ##
=======================================
  Coverage   59.85%   59.85%           
=======================================
  Files          70       70           
  Lines        8080     8080           
=======================================
  Hits         4836     4836           
  Misses       3244     3244           

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