Remove deprecated solr 7.6 from the code base

Author: mdnoble73

code/web/release_notes/24.05.00.MD

@@ -8,6 +8,9 @@
 - Remove unused "Individual MARC Path", "Number of characters to create folder from", and "Create Folder From Leading Characters" settings from Indexing Profile and Sideloads. (*MDN*)
 - Remove obsolete checks fo the file system for MARC data. (*MDN*)
 
+### Solr Updates
+- Remove deprecated solr 7.6 from the code base. (*MDN*)
+
 ### Testing Updates
 #### JUnit Test Updates
 - Setup Aspen for JUnit Testing (*MDN*)