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Edit the addresses of DTD files used for checkstyle
We are currently using the DTD files from `http://checkstyle.sourceforge.net/` and `http://puppycrawl.com/` in our config file of checkstyle. However, due to security reason, checkstyle decided to remove DTDs from above websites and ask users to use the DTD files from `https://checkstyle.org/`[1]. Let's update the addresses of DTD files correspondingly. Meanwhile, update the version of suppression DTD file to 1.2 because it is the version suggested from checkstyle. [2] [1] checkstyle/checkstyle#6478 [2] https://checkstyle.org/config_filters.html#SuppressionFilter_Examples
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