Full list of changes:

chore: fix cppcheck issues with v2.21.0

[Issue #3593 - @airween]

fix: ctl:ruleRemoveTargetByTag not removing XML attribute targets

[Issue #3592 - @fzipi]

Remove deprecated REQBODY_PROCESSOR_ERROR and REQBODY_PROCESSOR_ERROR_MSG

[Issue #3578 - @hnakamur]

Re-apply lost fix 4f33f5b: collection_unpack value_len underflow regression

[Issue #3560 - @g4mm4-VCF]