Upgrade sasl mechanism for infinispan in tests

[apupier]

with latest upgrade DIGEST_MD5 has been removed, moving to DIGEST-SHA-256

several tests were failing with:

Caused by: java.lang.SecurityException: ISPN004031: The selected
authentication mechanism 'DIGEST-MD5' is not among the supported server
mechanisms: [SCRAM-SHA-512, SCRAM-SHA-384, SCRAM-SHA-256,
DIGEST-SHA-512, DIGEST-SHA-384, DIGEST-SHA-256]

for instance https://ci-builds.apache.org/job/Camel/job/Camel%20Core%20(Build%20and%20test)/job/main/lastCompletedBuild/testReport/org.apache.camel.component.infinispan.remote.spring/SpringInfinispanRemoteIdempotentRepositorySpringIT/BuildAndTest___Matrix___JDK_NAME____jdk_25_latest___PLATFORM____ubuntu_avx____Build_and_test___testIdempotent/

notes:

• I have not found a constant which would help to detect issue at compile time.
• tests are often failing locally; usually first run is succesful, next ones are failing

Description

Target

• I checked that the commit is targeting the correct branch (Camel 4 uses the main branch)

Tracking

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Apache Camel coding standards and style

• I checked that each commit in the pull request has a meaningful subject line and body.

• I have run mvn clean install -DskipTests locally from root folder and I have committed all auto-generated changes.

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[apupier]

already fixed with 9f2b4f1