fix(deps): update dependency tar to v6

Author: renovate[bot]

package.json

@@ -31,7 +31,7 @@
  "homepage": "https://github.com/runk/node-geolite2#readme",
  "dependencies": {
  "node-fetch": "^2.7.0",
- "tar": "^5.0.5"
+ "tar": "^6.0.0"
  },
  "devDependencies": {
  "mocha": "^5.2.0",