Merge pull request #16453 from jsoref/codeql-quality-unused-local-variable-dnsdist

chore: Clean up unused variables (dnsdist)

diff --cc regression-tests.dnsdist/test_API.py
Simple merge

diff --cc regression-tests.dnsdist/test_Advanced.py
Simple merge

diff --cc regression-tests.dnsdist/test_Basics.py
Simple merge

diff --cc regression-tests.dnsdist/test_DNSCrypt.py
Simple merge

diff --cc regression-tests.dnsdist/test_DOH.py
Simple merge

diff --cc regression-tests.dnsdist/test_DOQ.py
Simple merge

diff --cc regression-tests.dnsdist/test_Protobuf.py
Simple merge

diff --cc regression-tests.dnsdist/test_ProxyProtocol.py
Simple merge

diff --cc regression-tests.dnsdist/test_Routing.py
Simple merge

diff --cc regression-tests.dnsdist/test_TCPKeepAlive.py
Simple merge