Bump commons-beanutils from 1.7.0 to 1.9.4

[BobDu]

ref: #5 (comment)

json-lib/src/main/java/net/sf/json/JSONObject.java

Line 654 in 9f2e33c

PropertyDescriptor[] pds = PropertyUtils.getPropertyDescriptors( bean );

After upgrade commons-beanutils to 1.9.4,

PropertyDescriptor[] pds = PropertyUtils.getPropertyDescriptors( bean );

field class not in PropertyUtils.getPropertyDescriptors result array.

Testing done

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[basil]

Thanks for the PR!