Just bump the JVM toolchain version to 17

As told by @waste-of-kindergarten, the build works with neither JDK 11 nor JDK 17 in IntelliJ IDEA.

See https://developer.android.com/build/releases/gradle-plugin#compatibility.

Author: ShreckYe

buildSrc/src/main/kotlin/common-conventions.gradle.kts

@@ -21,7 +21,7 @@ kotlin {
     // for Compose UI
 
     jvm() // TODO: `jvm("desktop")`?
-    jvmToolchain(11)
+    jvmToolchain(17)
 
     //androidTarget()