Unable to connect to repository while download thymeleaf plugin in Spring tool suite

[SandeepCreation]

Unable to connect to repository https://raw.githubusercontent.com/thymeleaf/thymeleaf-extras-eclipse-plugin/update-site/3.0.1/content.xml
Connect to https://raw.githubusercontent.com:443 [raw.githubusercontent.com/49.44.79.236] failed: Connection timed out: no further information

i use

Spring Tool Suite 4

Version: 4.17.2.RELEASE