Remove gorilla/context

[florianmouro]

Summary

Remove useless call and associated useless dependency.

It appears that the Clear call only affects data set through gorillaContext.Set which we do not use. Indeed, that's the only call we make to gorilla/context and no dependencies seems to rely on it. (On top of that, its use is discouraged in favor of context.Context since go 1.7.).

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Related issues :

• None

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation (update or create documentation)
• CI/CD
• Other

• Breaking change (fix or feature that would cause existing functionality to change)

[florianmouro]

For additional context, the call was mandatory 7 years ago to avoid memory leaks but is useless since sessions 1.2.0.
https://github.com/gorilla/sessions/releases/tag/v1.2.0
gorilla/sessions#175

[yyewolf]

Même chelou qu'il y avait du gorilla/context alors qu'on utilise pas gorilla/mux

Car même si le call était "utile" bah on utilise juste pas les features autre part donc bon