### CI Link

https://gradle-enterprise.elastic.co/s/jze725jpxi7ki/console-log?task=:x-pack:plugin:security:internalClusterTest

### Repro line

./gradlew ':x-pack:plugin:security:internalClusterTest' --tests "org.elasticsearch.xpack.security.authc.pki.PkiAuthDelegationIntegTests.testDelegateThenAuthenticate" -Dtests.seed=F5EC1FEFFC2FC08B -Dtests.locale=en-GB -Dtests.timezone=SystemV/PST8PDT -Druntime.java=20

### Does it reproduce?

Yes

### Applicable branches

main

### Failure history

_No response_

### Failure excerpt

The pki integ test began failing today. Looking at the certs the test uses, they are all expired:

```
❯ openssl x509 -enddate -noout -in testClient.crt
notAfter=Jul 18 13:33:41 2023 GMT
❯ openssl x509 -enddate -noout -in testIntermediateCA.crt
notAfter=Jul 18 13:32:34 2023 GMT
❯ openssl x509 -enddate -noout -in testRootCA.crt
notAfter=Jul 18 13:32:20 2023 GMT
```
x-pack/plugin/security/src/internalClusterTest/java/org/elasticsearch/xpack/security/authc/pki/PkiAuthDelegationIntegTests.java
+ usersPasswdHashed
            + "\n"
            + "my_kibana_system:"
            + usersPasswdHashed
            + "\n";
    }
    @Override
    protected String configRoles() {
        return Strings.format("""
            %s
            role_manage:
              cluster: [ manage ]
            role_manage_security:
              cluster: [ manage_security ]
            role_delegate_pki:
              cluster: [ delegate_pki ]
            role_all:
              cluster: [ all ]
            """, super.configRoles());
    }
    @Override
    protected String configUsersRoles() {
        return Strings.format("""
            %s
            role_manage:user_manage
            role_manage_security:user_manage_security
            role_delegate_pki:user_delegate_pki
            role_all:user_all
            kibana_system:my_kibana_system
            """, super.configUsersRoles());