Bump solr.version from 9.3.0 to 9.4.0

Bumps `solr.version` from 9.3.0 to 9.4.0.

Updates `org.apache.solr:solr-core` from 9.3.0 to 9.4.0

Updates `org.apache.solr:solr-solrj` from 9.3.0 to 9.4.0

---
updated-dependencies:
- dependency-name: org.apache.solr:solr-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.solr:solr-solrj
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -127,7 +127,7 @@ POSSIBILITY OF SUCH DAMAGE.
   </scm>
 
   <properties>
-    <solr.version>9.3.0</solr.version>
+    <solr.version>9.4.0</solr.version>
   </properties>
 
   <dependencies>