org.springframework.boot:spring-boot-starter-thymeleaf, org.springframework.boot:spring-boot-starter-freemarker, org.springframework.boot:spring-boot-starter-mustache, or org.springframework.boot:spring-boot-starter-groovy-templates
Swap for io.quarkus:quarkus-qute
There is more to this though than just swapping a dependency. The entire view layer (Thymeleaf or Freemarker) will have to be re-written in Quarkus Qute
https://quarkus.io/guides/qute
https://quarkus.io/guides/qute-reference