build: remove pluginRepositories

Author: javier-godoy

pom.xml

@@ -78,26 +78,6 @@
         </repository>
 	</repositories>
 
-    <pluginRepositories>
-        <pluginRepository>
-            <id>central</id>
-            <url>https://repo.maven.apache.org/maven2</url>
-            <snapshots>
-                <enabled>false</enabled>
-            </snapshots>
-        </pluginRepository>
-        <!-- Repository needed for prerelease versions of Vaadin -->
-        <pluginRepository>
-            <id>Vaadin prereleases</id>
-            <url>https://maven.vaadin.com/vaadin-prereleases</url>
-        </pluginRepository>
-        <pluginRepository>
-            <id>vaadin-snapshots</id>
-            <url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
-            <releases><enabled>false</enabled></releases>
-        </pluginRepository>
-    </pluginRepositories>
-
 	<dependencies>
 		<dependency>
 			<groupId>com.vaadin</groupId>