Bump org.apache.solr:solr-core from 6.3.0 to 8.11.3

Bumps org.apache.solr:solr-core from 6.3.0 to 8.11.3.

---
updated-dependencies:
- dependency-name: org.apache.solr:solr-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 8611111..6dbbf84 100644
--- a/pom.xml
+++ b/pom.xml
@@ -34,7 +34,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <solr.version>6.3.0</solr.version>
+    <solr.version>8.11.3</solr.version>
   </properties>
 
   <dependencies>