fix: type of level in GraylogHandler constructor

[lapie002]

Ref #42134

Description

Please include a summary of the change and which issue is fixed:

adds type of $level in GraylogHandler constructor

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [x] This change requires a documentation update

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

[xel1045]

@lapie002 Peux-tu me donner un peux de contexte pourquoi tu dois effectuer ce changement? J'essaie de comprendre pourquoi tu es le premier à rencontrer ce problème et que tu dois effectuer ce changement. Merci!

[lapie002]

Je me souviens plus (peut etre une indication de mon IDE). On peut rejetter la pr.