Use loop variable ApplicationContext to determine all Liquibase beans

[biergit]

spring-boot/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/liquibase/LiquibaseEndpoint.java

Line 65 in d2926e0

this.context.getBeansOfType(SpringLiquibase.class)

should be replaced with target.getBeansOfType(SpringLiquibase.class)

[wilkinsona]

Closing in favour of #22681.