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://docs.spring.io/spring-framework/docs/ with 1 occurrences migrated to:
  https://docs.spring.io/spring-framework/docs/ ([https](https://docs.spring.io/spring-framework/docs/) result 200).
* http://docs.spring.io/spring-shell/docs/current/api/ with 1 occurrences migrated to:
  https://docs.spring.io/spring-shell/docs/current/api/ ([https](https://docs.spring.io/spring-shell/docs/current/api/) result 200).
* http://maven.apache.org/xsd/maven-4.0.0.xsd with 14 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://www.apache.org/licenses/LICENSE-2.0 with 2 occurrences migrated to:
  https://www.apache.org/licenses/LICENSE-2.0 ([https](https://www.apache.org/licenses/LICENSE-2.0) result 200).

# Ignored
These URLs were intentionally ignored.

* http://maven.apache.org/POM/4.0.0 with 28 occurrences
* http://www.w3.org/2001/XMLSchema-instance with 14 occurrences

mvnw.cmd

@@ -7,7 +7,7 @@
 @REM "License"); you may not use this file except in compliance
 @REM with the License.  You may obtain a copy of the License at
 @REM
-@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM    https://www.apache.org/licenses/LICENSE-2.0
 @REM
 @REM Unless required by applicable law or agreed to in writing,
 @REM software distributed under the License is distributed on an