ci: use correct jdk version

.gitlab-ci.yml

-image: "k8r.eu/justjanne/android-sdk:be7526df"
+image: "k8r.eu/justjanne/android-sdk:dfb791e9"
 
 cache:
   key: "$CI_PROJECT_NAME"

gradle/convention/build.gradle.kts

@@ -37,6 +37,6 @@ gradlePlugin {
 
 configure<JavaPluginExtension> {
   toolchain {
-    languageVersion.set(JavaLanguageVersion.of(11))
+    languageVersion.set(JavaLanguageVersion.of(17))
   }
 }

gradle/convention/src/main/kotlin/KotlinAndroidConvention.kt

@@ -44,7 +44,7 @@ class KotlinAndroidConvention : Plugin<Project> {
         targetCompatibility = JavaVersion.VERSION_11
 
         toolchain {
-          languageVersion.set(JavaLanguageVersion.of(11))
+          languageVersion.set(JavaLanguageVersion.of(17))
         }
       }
     }

gradle/convention/src/main/kotlin/KotlinConvention.kt

@@ -47,7 +47,7 @@ class KotlinConvention : Plugin<Project> {
         targetCompatibility = JavaVersion.VERSION_11
 
         toolchain {
-          languageVersion.set(JavaLanguageVersion.of(11))
+          languageVersion.set(JavaLanguageVersion.of(17))
         }
       }
     }