IONOS(user_oidc): update user_oidc submodule to v7.3.2

[thlehmann-ionos]

To fix:

Steps:

1. Open Nextcloud (http://localhost:8080)
2. Find yourself redirected to Keycloak
3. Enable remember me (see note 1) and login as test/test
4. Find yourself logged in
5. Open http://localhost:8079/realms/mcve/login-actions/authenticate in a second tab
6. Expect: the message You are already logged in. (assertion that your Keycloak session is still valid, needed after browser restart)
7. Close your browser
8. Open your browser (don't restart the previous session; see note 2)
9. Open http://localhost:8080 and http://localhost:8079/realms/mcve/login-actions/authenticate in individual tabs
10. Expect: the first tab should have your Nextcloud session, the second should show You are already logged in. (the 2nd tab confirms that Keycloak still has a session)
11. Open the browser Devtools for the Nextcloud tab (to record network traffic)
12. In Nextcloud logout
13. Expect: Keycloak logout confirmation dialog
14. Actual: the page apparently reloads and you're still logged in in Nextcloud
15. In Nextcloud logout again
16. Observe: You're logged out and be back at the Keycloak login form

[Copilot]

Pull Request Overview

This PR updates the user_oidc submodule from version 9bbc500 to version 703e9e3 (v7.3.2) to fix an issue where users remain logged into Nextcloud after attempting to logout, despite being properly logged out of Keycloak.

• Updates user_oidc submodule to v7.3.2 to resolve logout functionality

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