build: specify jdk 17 for all android compilation tasks

bdk-android/lib/build.gradle.kts

@@ -38,6 +38,20 @@ android {
     }
 }
 
+kotlin {
+    tasks.withType<KotlinCompile>().configureEach {
+        kotlinOptions {
+            jvmTarget = "17"
+        }
+    }
+}
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
+
 dependencies {
     implementation("net.java.dev.jna:jna:5.14.0@aar")
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7")