maven: force https url for the maven central repository

Effective January 15, 2020, The Central Repository no longer supports insecure
communication over plain HTTP and requires that all requests to the repository
are encrypted over HTTPS.

See https://blog.sonatype.com/central-repository-moving-to-https
and https://support.sonatype.com/hc/en-us/articles/360041287334

Signed-off-by: Tatiana Leon <tatiana.leon@digi.com>

Author: tatianaleon

pom.xml

@@ -362,6 +362,15 @@
 
 	<!-- Repositories -->
 	<repositories>
+		<repository>
+			<id>maven-central-repo</id>
+			<name>Central Maven Repository</name>
+			<url>https://repo.maven.apache.org/maven2</url>
+			<layout>default</layout>
+			<snapshots>
+				<enabled>false</enabled>
+			</snapshots>
+		</repository>
 		<repository>
 			<id>digi-repo</id>
 			<name>Digi Releases Repository</name>