Revert "GH-2333 - Make API Guardian an optional / provided dependency."

This reverts commit bd4a6be.

Author: michael-simons

pom.xml

@@ -172,8 +172,6 @@
 				<groupId>org.apiguardian</groupId>
 				<artifactId>apiguardian-api</artifactId>
 				<version>${apiguardian.version}</version>
-				<scope>provided</scope>
-				<optional>true</optional>
 			</dependency>
 			<dependency>
 				<groupId>org.neo4j</groupId>