logs: trace docker version list

lib/manager/docker/package.js

@@ -89,7 +89,7 @@ async function getPackageUpdates(config) {
         )
         .filter(prefix => compareVersions(prefix, tagVersion) > 0);
     }
-    logger.debug({ versionList }, 'upgrades versionList');
+    logger.trace({ versionList }, 'upgrades versionList');
     const versionUpgrades = {};
     for (const version of versionList) {
       const paddedVersion = padRange(version);