chef v17 Deprecation warnings

[naveen-kumar-r]

chef v17 is reporting following deprecation warnings with telegraf-cookbook v0.12.0.
Please let me know if you want me to contribute to fixing this issue.

OS: CentOS 7.9
Chef Infra Client: 17.3.48

  The  resource in the telegraf cookbook should declare `unified_mode true` at 5 locations:
    - /var/chef/cache/cookbooks/telegraf/resources/config.rb
    - /var/chef/cache/cookbooks/telegraf/resources/inputs.rb
    - /var/chef/cache/cookbooks/telegraf/resources/install.rb
    - /var/chef/cache/cookbooks/telegraf/resources/outputs.rb
    - /var/chef/cache/cookbooks/telegraf/resources/perf_counters.rb
   See https://docs.chef.io/deprecations_unified_mode/ for further details.