Revert "config: bump checkstyle version"
Revert "config: bump checkstyle version"

This reverts commit 4ae24687becebc1abac8cd0f706a455d46535839.

checkstyle/checkstyle,rnveach/checkstyle,romani/checkstyle,checkstyle/checkstyle,checkstyle/checkstyle,rnveach/checkstyle,rnveach/checkstyle,romani/checkstyle,checkstyle/checkstyle,romani/checkstyle,romani/checkstyle,rnveach/checkstyle,romani/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,romani/checkstyle,checkstyle/checkstyle,rnveach/checkstyle