Adds compatibility for most recent, included in ruby 3.3.3 logger. ruby/logger@7aabb0b

Issue

I've got 3.3.3 ruby with bundled Logger 1.6.0

eval error: undefined method `[]' for nil
  /Users/dev/.asdf/installs/ruby/3.3.3/lib/ruby/3.3.0/logger.rb:384:in `level'
  /Users/dev/.asdf/installs/ruby/3.3.3/lib/ruby/3.3.0/logger.rb:653:in `add'
  /Users/dev/.asdf/installs/ruby/3.3.3/lib/ruby/3.3.0/logger.rb:697:in `info'
  /Users/dev/.asdf/installs/ruby/3.3.3/lib/ruby/3.3.0/forwardable.rb:240:in `info'

there is missing empty hash in initialize.

Description of changes:

It should be compatible with previous versions of Ruby.

Target (OCI, Managed Runtime, both):

ruby 3.3.3 or most recent logger version.
I run lambda in self hosted ruby container in general, but it is not required to test within docker, as code breaks on specs when applying LoggerPatch.

solves #33

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.