Update StringTemplate version in gradle.properties

[eedijs]

Newer version contains bugfixes.

[eedijs]

This version also contains license in pom.xml:

<licenses>
    <license>
        <name>The BSD License</name>
        <url>http://www.antlr.org/license.html</url>
        <distribution>repo</distribution>
    </license>
</licenses>

Which is very useful for us - we have an internal tool which scans all maven dependencies and checks their licenses, and it is much easier if the license is located in pom.xml.