Bump lc_solr_sortable from eaf90d3 to 7d9c78f

Bumps [lc_solr_sortable](https://github.com/tulibraries/lc_solr_sortable) from `eaf90d3` to `7d9c78f`.
- [Commits](tulibraries/lc_solr_sortable@eaf90d3...7d9c78f)

---
updated-dependencies:
- dependency-name: lc_solr_sortable
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -10,7 +10,7 @@ GIT
 
 GIT
   remote: https://github.com/tulibraries/lc_solr_sortable
-  revision: eaf90d314160e137e1438389bf612c779ba3d503
+  revision: 7d9c78f81bee657a139049d32f8d8a5634e83f47
   branch: main
   specs:
     lc_solr_sortable (0.1.0)