Change type of "internal exception" throw for unexpected code path to…

… IllegalArgumentException (from RuntimeException)

src/main/java/tools/jackson/core/util/VersionUtil.java

@@ -103,10 +103,10 @@ protected static int parseVersionPart(String s) {
      */
 
     public final static void throwInternal() {
-        throw new RuntimeException("Internal error: this code path should never get executed");
+        throw new IllegalStateException("Internal error: this code path should never get executed");
     }
 
     public final static <T> T throwInternalReturnAny() {
-        throw new RuntimeException("Internal error: this code path should never get executed");
+        throw new IllegalStateException("Internal error: this code path should never get executed");
     }
 }