Use HTTPS for external links wherever possible

See gh-16276

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/json-shade/java/org/springframework/boot/configurationprocessor/json/JSONTokener.java

@@ -151,7 +151,7 @@ public class JSONTokener {
 				/*
 				 * Skip a # hash end-of-line comment. The JSON RFC doesn't specify this
 				 * behavior, but it's required to parse existing documents. See
-				 * http://b/2571423.
+				 * https://b/2571423.
 				 */
 				skipToEndOfLine();
 				continue;