refactor(message): add strict input typing

Author: byCedric

@commitlint/message/src/index.ts

@@ -1,5 +1,5 @@
 export default message;
 
-function message(input: any[] = []) {
+function message(input: (string | null | undefined)[] = []) {
 	return input.filter(Boolean).join(' ');
 }