Disallow static import of values (#1998)

This matches changes in Error Prone's `BadImport` check.

See google/error-prone@7e6e113

Author: Stephan202

error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/NonStaticImport.java

@@ -144,7 +144,8 @@ public final class NonStaticImport extends BugChecker implements CompilationUnit
           "newInstance",
           "of",
           "parse",
-          "valueOf");
+          "valueOf",
+          "values");
 
   /** Instantiates a new {@link NonStaticImport} instance. */
   public NonStaticImport() {}