DATAJPA-1512 - URL Cleanup.
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://maven.apache.org/xsd/maven-4.0.0.xsd with 1 occurrences migrated to:
https://maven.apache.org/xsd/maven-4.0.0.xsd ([https](https://maven.apache.org/xsd/maven-4.0.0.xsd) result 200).
* http://projects.spring.io/spring-data-jpa with 1 occurrences migrated to:
https://projects.spring.io/spring-data-jpa ([https](https://projects.spring.io/spring-data-jpa) result 301).
These URLs were intentionally ignored.
* http://maven.apache.org/POM/4.0.0 with 2 occurrences
* http://www.w3.org/2001/XMLSchema-instance with 1 occurrences
Original pull request: #329