I have recently created a Spring Boot application where I am using the liquibase spatial index property. My install.xml liquibase file looks something like this:

<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
   xmlns:spatial="http://www.liquibase.org/xml/ns/dbchangelog-ext/liquibase-spatial"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
      http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd 
   http://www.liquibase.org/xml/ns/dbchangelog-ext/liquibase-spatial 
      **http://lonnyj.github.com/liquibase-spatial/liquibase-spatial.xsd**">

After some days, my application suddenly stopped working and I started getting the following error:

2021-04-16 07:21:15,637 [main] WARN l.p.core.xml.XMLChangeLogSAXParser$1 - schema_reference.4: Failed to read schema document 'http://lonnyj.github.com/liquibase-spatial/liquibase-spatial.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not xsd:schema.

It seems that the path got changed all of a sudden. Could you please check and let me know what is the issue?