Update Solr release

Signed-off-by: Stefan Weil <sw@weilnetz.de>

Author: Stefan Weil

build.xml

@@ -61,7 +61,7 @@
   <property name="default_test_timeout" value="5000" /><!-- default timeout (in ms) for Mink tests; increase when tests fail on slow systems -->
   <property name="solr_startup_sleep" value="0" />
   <property name="solr_additional_jvm_options" value="-Dlog4j2.formatMsgNoLookups=true" />
-  <property name="solr_version" value="9.8.1" />
+  <property name="solr_version" value="9.9.0" />
   <property name="solr_port" value="8983" />
   <property name="skip_phpdoc" value="false" />
   <property name="phpdoc_version" value="3.3.1" />