Wrong idno type

[matyaskopp]

reported here: https://github.com/clarin-eric/ParlaMint/issues/173

Replace URL with URI in //publicationStmt/idno/@type:

         <publicationStmt>
            <publisher>
               <orgName xml:lang="en">CLARIN research infrastructure</orgName>
               <orgName xml:lang="cs">Výzkumná infrastruktura CLARIN</orgName>
               <ref target="https://www.clarin.eu/">www.clarin.eu</ref>
            </publisher>
            <idno type="URL">https://github.com/clarin-eric/ParlaMint</idno>
            <pubPlace>
               <ref target="https://github.com/clarin-eric/ParlaMint">https://github.com/clarin-eric/ParlaMint</ref>
            </pubPlace>
            <availability status="free">
               <licence>http://creativecommons.org/licenses/by/4.0/</licence>
               <p xml:lang="en">This work is licensed under the <ref target="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</ref>.</p>
               <p xml:lang="cs">Toto dílo je licencováno <ref target="http://creativecommons.org/licenses/by/4.0/">Creative Commons Uveďte původ 4.0 Mezinárodní Veřejná licence</ref>.</p>
            </availability>
            <date when="2022-02-15">2022-02-15</date>
         </publicationStmt>