Bump keycloak 26.4.2

[grafjo]

Motivation

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What

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Why

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How

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Verification Steps

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2. Create a new item N with the info X
3. Try to edit this item
4. Check if in the left menu the feature X is not so long present.

Checklist:

• Code has been tested locally by PR requester
• Changes have been successfully verified by another team member

Progress

• Finished task
• TODO

Additional Notes

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[alexted]

Since Keycloak now has native metrics support built-in, is this plugin and this specific change still relevant? It seems like this functionality is already covered by the core platform.