Bump ontologies_linked_data pin to latest branch HEAD

Picks up the fresh-collection unindex skip, nil-submission guard,
and requested_lang restore commits on the linked branch.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mdorf

Gemfile.lock

@@ -37,7 +37,7 @@ GIT
 
 GIT
   remote: https://github.com/ncbo/ontologies_linked_data.git
-  revision: b4ff72abf77ba223540e0002e304d282d43f0060
+  revision: e7a9e014fddfbb263643f986884c1e9332dec187
   branch: fix/incorrect-search-result-ranking
   specs:
     ontologies_linked_data (0.0.1)