Fix ISIDOREFetcherTest

[koppor]

Fix the fetcher - see https://devdocs.jabref.org/code-howtos/fetchers.html for help

ISIDOREFetcherTest > author() FAILED
    org.jabref.logic.importer.FetcherException at ISIDOREFetcherTest.java:103
        Caused by: javax.net.ssl.SSLHandshakeException at ISIDOREFetcherTest.java:103
            Caused by: sun.security.validator.ValidatorException at ISIDOREFetcherTest.java:103
                Caused by: sun.security.provider.certpath.SunCertPathBuilderException at ISIDOREFetcherTest.java:103
(and more)

[thesauravpoddar]

/assign-me

[jabref-machine]

⚠️ Assignment Limit Reached

Hi @thesauravpoddar, you've reached the maximum number of 3 concurrent assignments.

Note

Please complete or unassign from your current issues before taking on new ones.

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• Use /unassign-me on an issue you're no longer working on
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