[MWRAPPER-132] Inlined mvnw Downloader.java uses new URL(String), which is deprecated in Java 21 #275

James Z.M. Gao opened MWRAPPER-132 and commented

new URL(String)

was deprecated in Java 21: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/net/URL.html#constructor-deprecation

The Maven Wrapper docs say that Java 7+ is supported, so we can switch to using

URI.create(String).toURL()

instead, which is supported in Java 7

Affects: 3.2.0

Issue Links:

• MWRAPPER-124 MavenWrapperDownloader uses new URL(String), which is deprecated in Java 21
  ("is a clone of")

Remote Links:

• GitHub Pull Request #133