[CALCITE-2352] Fix missing suppressions.xml change
[CALCITE-2352] Fix missing suppressions.xml change

Add change to suppressions.xml for generated FilteredConstants
file, after updating to checkstyle 6.18

apache/calcite-avatica,looker-open-source/calcite-avatica,apache/calcite-avatica,apache/calcite-avatica,looker-open-source/calcite-avatica,looker-open-source/calcite-avatica,apache/calcite-avatica,looker-open-source/calcite-avatica,apache/calcite-avatica,looker-open-source/calcite-avatica