conf: use a custom flb-2.1.3 fork to not require root

[Minipada]

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Test (add, remove, modify test(s))
• Other

What I did

Bump Fluent bit to 2.1.3, does not require sudo to install anymore

I'm not a dummy, so I've checked these

• 📑 I documented correctly following our guidelines
• 💯 I tested locally and it is working
• 🟢 My code does not fail neither code linting checks nor unit test.

Thank you!

[codecov]

Codecov Report

Merging #235 (f87c3b9) into humble (85c07a3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           humble     #235   +/-   ##
=======================================
  Coverage   12.90%   12.90%           
=======================================
  Files          75       75           
  Lines        4272     4272           
=======================================
  Hits          551      551           
  Misses       3721     3721