Remove no more used dependency mock_javamail

[apupier]

It was used only in ittests, but seems there is no more any tests related to mail in itest

also note that latest version (still from 2 years ago) is not available on maven central but only on jenkins repository

Description

Target

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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.

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• parent
• tests/camel-itest

✅ POM dependency changes: targeted tests included

Changed properties: mock-javamail-version

Modules affected by dependency changes (1)

• :camel-itest

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