update kcov for code coverage
update kcov for code coverage

redtankd/rust-test,redtankd/rust-test,redtankd/github-test,redtankd/rust-test,redtankd/github-test,redtankd/github-test,redtankd/github-test,redtankd/rust-test,redtankd/rust-test,redtankd/rust-test