Upgrade to Solr 8.0.0

Closes gh-16272

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -175,7 +175,7 @@
 		<servlet-api.version>4.0.1</servlet-api.version>
 		<slf4j.version>1.7.26</slf4j.version>
 		<snakeyaml.version>1.24</snakeyaml.version>
-		<solr.version>7.4.0</solr.version>
+		<solr.version>8.0.0</solr.version>
 		<!-- deprecated in favor of "spring-framework.version" -->
 		<spring.version>5.2.0.BUILD-SNAPSHOT</spring.version>
 		<spring-amqp.version>2.1.4.RELEASE</spring-amqp.version>