updated default m2 repository location

lib/libraries.properties

@@ -26,7 +26,7 @@ m2.antlib.url=${m2.url}/${m2.version}/binaries/${m2.jar.name}
 m2.sha1.checksum=b09be554228d66d208e5fef5266844aacf443abc
 
 # Repository to use by default for fetching dependencies.
-m2.repo=http://repo1.maven.org/maven2/
+m2.repo=https://repo1.maven.org/maven2/
 
 # Versions of different libraries. Please keep in alphabetical order, except
 # when a specific dependency forces them to be out-of-order