CORE-1697 - URISyntaxException starting Liquibase in Tomcat under path containing white space

Avoid using deprecated method "toURL" of java.io.File because, as the documentations says, "This method does not automatically escape characters that are illegal in URLs. It is recommended that new code convert an abstract pathname into a URL by first converting it into a URI, via the toURI method, and then converting the URI into a URL via the URI.toURL method.".