fix(deps): update dependency io.flipt:flipt-java to v0.2.15 (#537)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

providers/flipt/pom.xml

@@ -20,7 +20,7 @@
         <dependency>
             <groupId>io.flipt</groupId>
             <artifactId>flipt-java</artifactId>
-            <version>0.2.14</version>
+            <version>0.2.15</version>
         </dependency>
 
         <dependency>