[6.2] update pom.xml to use latest uber-jar

[blefebvre]

For reference, to install a snapshot: mvn install:install-file -Dfile=cq-quickstart-6.2.0-load20-obfuscated-apis.jar -DgroupId=com.adobe.aem -DartifactId=uber-jar -Dversion=6.2.0-load20 -Dpackaging=jar -Dclassifier=obfuscated-apis

And update the pom.xml to use:

<dependency>
            <groupId>com.adobe.aem</groupId>
            <artifactId>uber-jar</artifactId>
            <version>6.2.0-load20</version>
            <scope>provided</scope>
            <classifier>obfuscated-apis</classifier>
</dependency>