fix CI warnings on license and shellcheck

Author: ktoso

.github/scripts/validate_sample.sh

@@ -28,5 +28,5 @@ echo -e "Validated sample '${BOLD}${sampleDir}${RESET}': ${BOLD}passed${RESET}."
 cd - || exit
 
 echo
-printf "Done validating sample: ${sampleDir}"
+printf "Done validating sample: %s" "${sampleDir}"
 echo -e "${GREEN}done${RESET}."

Sources/JavaKit/JavaKitVM/JavaVirtualMachine.swift

@@ -249,7 +249,6 @@ extension JavaVirtualMachine {
             // wrapper.
             let javaVirtualMachine = JavaVirtualMachine(adoptingJVM: jvm!)
             sharedJVMPointer = javaVirtualMachine
-            print("WAS EXISTING")
             return javaVirtualMachine
           }
 
@@ -261,7 +260,6 @@ extension JavaVirtualMachine {
           // Create a new instance of the JVM.
           let javaVirtualMachine: JavaVirtualMachine
           do {
-            print("CREATE")
             javaVirtualMachine = try JavaVirtualMachine(
               classpath: classpath,
               vmOptions: vmOptions,