Drop pin on nlohmann json

[mcbarton]

Description

Please include a summary of changes, motivation and context for this PR.

I was looking through Emscripten forges recipe repo and noticed the pin on nlohmann json is being dropped, so this PR does the same for the main repo.

Fixes # (issue)

Type of change

Please tick all options which are relevant.

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

[anutosh491]

You also need to make the nlohmann_json_abi changes !

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.10%. Comparing base (df191a1) to head (f0b68ee).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #378      +/-   ##
==========================================
+ Coverage   81.78%   82.10%   +0.31%     
==========================================
  Files          20       20              
  Lines         950      950              
  Branches       87       87              
==========================================
+ Hits          777      780       +3     
+ Misses        173      170       -3     

see 1 file with indirect coverage changes
see 1 file with indirect coverage changes

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[mcbarton]

You also need to make the nlohmann_json_abi changes !

@anutosh491 Thanks for the tip. Can you point me towards the PR where this was done in Emscripten forge, and I will make the changes needed here. To me it seems that this PR was opened up straight after xeus-cpps recipe in Emscripten forge was updated to 0.7.2

[anutosh491]

Check the latest recipes on conda-forge and emscripten-forge (and use a git blame if that helps. On phone right now so won't be able to find a link)

This is not an emscripten env specific change for your information.

[mcbarton]

Not sure why nlohmann_json-abi can be found when doing the build on the Github runners, but not the read the docs build. I will investigate later.

[anutosh491]

Okay I'm guessing this solves the build the docs thing. Let's merge it and then you can close my previous Pr I guess ?