* resync the alt-nodejs18-npm changelog with the package revision: the npm changelog was left at 10.8.2-18.20.8.17 while debian/changelog had advanced to 18.20.8-19, so the npm binary package shipped a revision suffix that no longer matched the runtime it ships with. Both changelogs are bumped to revision 20 rather than only fast-forwarding the npm one, because an out-of-sync revision has already been released, so the npm version has to move forward on a revision that is still free * buildsys-pre-build: assert that the revision suffix in debian/alt-nodejs*-npm.changelog matches the debian/changelog version, not just that the npm upstream version matches deps/npm/package.json, so a forgotten npm changelog bump fails the build instead of silently shipping a stale npm revision