Bump lumberjack from 1.2.8 to 1.2.9

Bumps [lumberjack](https://github.com/bdurand/lumberjack) from 1.2.8 to 1.2.9.
- [Release notes](https://github.com/bdurand/lumberjack/releases)
- [Changelog](https://github.com/bdurand/lumberjack/blob/master/CHANGELOG.md)
- [Commits](bdurand/lumberjack@v1.2.8...v1.2.9)

---
updated-dependencies:
- dependency-name: lumberjack
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -38,7 +38,7 @@ GEM
     listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    lumberjack (1.2.8)
+    lumberjack (1.2.9)
     method_source (1.0.0)
     mini_portile2 (2.8.2)
     nenv (0.3.0)