Migrate to new URI API

[koppor]

Applies https://docs.openrewrite.org/recipes/java/migrate/net/urlconstructorstourirecipes

This reduces compilation warnings.

Mandatory checks

• Change in CHANGELOG.md described in a way that is understandable for the average user (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

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[Siedlerchr]

seems like it just didn't clean up the imports

[Siedlerchr]

still some errros

(java:2496): dbind-WARNING **: 10:50:50.477: AT-SPI: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

Task :test
org.jabref.logic.net.URLUtilTest

Test isURLshouldRejectInvalidURL() FAILED

java.lang.IllegalArgumentException: URI is not absolute

Test isURLshouldRejectEmbeddedURL() FAILED

java.lang.IllegalArgumentException: Illegal character in scheme name at index 4: dblp computer science bibliography, http://dblp.org/

[github-actions]

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