chore: sort contributors alphabetically (#978)

This is getting long, and order isn't meaningful, so let's make it
alphabetical.

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

.all-contributorsrc

@@ -694,6 +694,7 @@
       ]
     }
   ],
+  "contributorsSortAlphabetically": true,
   "contributorsPerLine": 7,
   "skipCi": true,
   "commitType": "docs"