Update dependency com.graphql-java:graphql-java to v26 (#299)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 # Libraries
 kotest = "6.1.11"
-graphql-java = "25.0"
+graphql-java = "26.0"
 graphql-kickstart-spring-boot = "15.1.0"
 commons-text = "1.15.0"
 spring-boot = "3.5.13"