dev: Normalize cppiterop specification in dev environment

[jjerphan]

Description

micromamba 2.6.0 appears to be case-sensitive on MatchSpec in some context.

I can reproduce the error as of main and cannot with the change proposed by this PR.

Fixes #482.

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Added/removed dependencies
• Required documentation updates

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.99%. Comparing base (58d6174) to head (b06c0c3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #483      +/-   ##
==========================================
+ Coverage   73.51%   73.99%   +0.48%     
==========================================
  Files          23       23              
  Lines        1193     1196       +3     
  Branches      111      111              
==========================================
+ Hits          877      885       +8     
+ Misses        316      311       -5     

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[mcbarton]

@jjerphan you just need to update this wasm host environment file too https://github.com/jjerphan/xeus-cpp/blob/dev/cppiterop-dev-env/environment-wasm-host.yml and the ci should pass.