### 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
public class PkiAuthDelegationIntegTests extends SecurityIntegTestCase {
    private static final ParseField AUTHENTICATION_FIELD = new ParseField("authentication");
    @Override
    public Settings nodeSettings(int nodeOrdinal, Settings otherSettings) {
        return Settings.builder()
            .put(super.nodeSettings(nodeOrdinal, otherSettings))
            .put(XPackSettings.TOKEN_SERVICE_ENABLED_SETTING.getKey(), true)
            
            .put("xpack.security.authc.realms.pki.pki1.order", "2")
            .putList(
                "xpack.security.authc.realms.pki.pki1.certificate_authorities",
                getDataPath("/org/elasticsearch/xpack/security/action/pki_delegation/testRootCA.crt").toString()
            )
            .put("xpack.security.authc.realms.pki.pki1.files.role_mapping", getDataPath("role_mapping.yml"))
            
            .put("xpack.security.authc.realms.pki.pki2.order", "3")
            .putList(
                "xpack.security.authc.realms.pki.pki2.certificate_authorities",