Update dependency sh.ory.hydra:hydra-client to v2

Author: renovate[bot]

backend/pom.xml

@@ -17,7 +17,7 @@
         <java.version>17</java.version>
 
         <kratos-client.version>0.7.6-alpha.7</kratos-client.version><!-- updating here weirdly breaks the settings page/avatar stuff, so lets not for now -->
-        <hydra-client.version>1.11.8</hydra-client.version>
+        <hydra-client.version>2.0.1</hydra-client.version>
         <okhttp.version>4.10.0</okhttp.version>
         <jdbi3-bom.version>3.34.0</jdbi3-bom.version>
         <annotations.version>23.0.0</annotations.version>