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 <Jonathan.Leitschuh@gmail.com>

pom.xml

@@ -106,7 +106,7 @@
         </repository>
         <snapshotRepository>
             <id>jfrog-snapshots</id>
-            <url>http://oss.jfrog.org/artifactory/oss-snapshot-local</url>
+            <url>https://oss.jfrog.org/artifactory/oss-snapshot-local</url>
         </snapshotRepository>
     </distributionManagement>