This commit updates URLs to prefer the https protocol. Redirects are not followed to avoid accidentally expanding intentionally shortened URLs (i.e. if using a URL shortener).

# Fixed URLs

## Fixed Success
These URLs were switched to an https URL with a 2xx status. While the status was successful, your review is still recommended.

* http://www.apache.org/licenses/LICENSE-2.0 migrated to:
  https://www.apache.org/licenses/LICENSE-2.0 ([https](https://www.apache.org/licenses/LICENSE-2.0) result 200).
* http://repo.spring.io/libs-milestone-local migrated to:
  https://repo.spring.io/libs-milestone-local ([https](https://repo.spring.io/libs-milestone-local) result 302).
* http://repo.spring.io/libs-snapshot-local migrated to:
  https://repo.spring.io/libs-snapshot-local ([https](https://repo.spring.io/libs-snapshot-local) result 302).
* http://repo.spring.io/release migrated to:
  https://repo.spring.io/release ([https](https://repo.spring.io/release) result 302).

# Ignored
These URLs were intentionally ignored.

* http://maven.apache.org/POM/4.0.0
* http://maven.apache.org/xsd/maven-4.0.0.xsd
* http://www.w3.org/2001/XMLSchema-instance