[MWRAPPER-92] Use https in license links of generated files

**[Michael Keppler](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=bananeweizen)** opened **[MWRAPPER-92](https://issues.apache.org/jira/browse/MWRAPPER-92?redirect=false)** and commented

The generated scripts mvnw and mvnw.cmd contain links to the Apache license texts. Please make them use https instead of http.

https is already used for the same links in other generated files, like maven-wrapper.properties (and should generally be the default nowadays).

Found because we monitor our own repositories with https://github.com/spring-io/nohttp

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**Affects:** 3.1.1

**Issue Links:**
- [MWRAPPER-66](https://issues.apache.org/jira/browse/MWRAPPER-66) maven-wrapper.properties - incorrect header reported by rat plugin

- [LEGAL-265](https://issues.apache.org/jira/browse/LEGAL-265) What are the valid URLs for LICEN[SE-2](https://issues.apache.org/jira/browse/SE-2).0 at apache.org?