Use proper CentOS base image

See gh-24344

Author: snicoll

spring-boot-tests/spring-boot-integration-tests/spring-boot-launch-script-tests/src/test/resources/conf/CentOS/7.9-27525fe9/Dockerfile renamed to spring-boot-tests/spring-boot-integration-tests/spring-boot-launch-script-tests/src/test/resources/conf/CentOS/7.9-e4ca2ed0/Dockerfile

@@ -1,5 +1,5 @@
 # CentOS 7.9 from 18/11/2020
-FROM centos@sha256:27525fe9e8a84f95baf88459070124628bf83da7216052ea9365fe46e93a102f
+FROM centos@sha256:e4ca2ed0202e76be184e75fb26d14bf974193579039d5573fb2348664deef76e
 RUN yum install -y wget && \
     yum install -y curl && \
     wget --output-document jdk.rpm \