chore: Use v4 version of github.com/pierrec/lz4

[jb-abbadie]

Description

Update "github.com/pierrec/lz4" to v4

We used non-versionned path that why we had -incompatible in go.mod

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Checklist

• Linter passes correctly
• Add tests which fail without the change (if possible)
• All tests passing
• Extended the README / documentation, if necessary

Does this introduce a breaking change?

• Yes
• No

Further comments

This was separated from PR in order to keep them simple

[mga-chka]

Since the PR increases the a dependancy from 2 major versions, it's worth testing the performance & doing a manual end to end test to be sure there is no regression.
(I don't think there are automated tests in the codebase relying on lz4)

[jb-abbadie]

Closing because of lack of time in order to perform benchmarks