### 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
if (randomBoolean()) {
            certificateChain = List.of(clientCertificate, intermediateCA);
        } else {
            certificateChain = List.of(clientCertificate, intermediateCA, rootCA);
        }
        for (String delegateeUsername : Arrays.asList("user_manage", "user_manage_security")) {
            RequestOptions.Builder optionsBuilder = RequestOptions.DEFAULT.toBuilder();
            optionsBuilder.addHeader(
                "Authorization",
                basicAuthHeaderValue(delegateeUsername, SecuritySettingsSourceField.TEST_PASSWORD_SECURE_STRING)
            );
            ResponseException e = expectThrows(
                ResponseException.class,
                () -> getSecurityClient(optionsBuilder.build()).delegatePkiAuthentication(certificateChain)
            );
            assertThat(
                e,
                throwableWithMessage(containsString("action [cluster:admin/xpack/security/delegate_pki] is unauthorized for user"))
            );
        }
    }
    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/97772")
    public void testDelegatePkiWithRoleMapping() throws Exception {
        X509Certificate clientCertificate = readCertForPkiDelegation("testClient.crt");
        X509Certificate intermediateCA = readCertForPkiDelegation("testIntermediateCA.crt");
        X509Certificate rootCA = readCertForPkiDelegation("testRootCA.crt");
        final List<X509Certificate> certificateChain;
        
        if (randomBoolean()) {
            certificateChain = List.of(clientCertificate, intermediateCA);