build: Rm sphinx pin

[cadenmyers13]

closes#99

[cadenmyers13]

@sbillinge ready for review/merge

[sbillinge]

@cadenmyers13 this is failing tests. I have seen this error before but didnt get to the bottom of it.

please could you also put in the PR to remove matrix on merge to main in this repo also?

[cadenmyers13]

@sbillinge This is failing because of the latest diffpy.utils release. Its running tests on utils 3.6.1 and not 3.7.1. I put in a PR (that is passing) that should fix this.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.63%. Comparing base (c404c4d) to head (4de8b11).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #102 +/- ##
=======================================
Coverage 93.63% 93.63% =======================================
Files 4 4 Lines 220 220 =======================================
Hits 206 206 Misses 14 14 

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