Use HTTPS instead of HTTP to resolve dependencies

This fixes a security vulnerability in this project where the `pom.xml`
files were configuring Maven to resolve dependencies over HTTP instead of
HTTPS.

Signed-off-by: Jonathan Leitschuh <[email protected]>

Author: JLLeitschuh

pdb/pom.xml

@@ -119,7 +119,7 @@
 		<repository>
 
 			<id>virtuoso-repo</id>
-                        <url>http://maven.aksw.org/repository/internal/</url>
+                        <url>https://maven.aksw.org/repository/internal/</url>
                         <releases>
                                 <enabled>true</enabled>
                         </releases>