Bump the JVM toolchain to 11 to resolve some errors

```
Cannot inline bytecode built with JVM target 11 into bytecode that is being built with JVM target 1.8. Specify proper '-jvm-target' option.
```

Author: ShreckYe

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

@@ -21,7 +21,7 @@ kotlin {
     // for Compose UI
 
     jvm() // TODO: `jvm("desktop")`?
-    jvmToolchain(8)
+    jvmToolchain(11)
 
     //androidTarget()