blake2b is not fips compliant -> adding usedforsecurity=False since i…

…t is only used for caching not security applications (#285)

Co-authored-by: Kar Petrosyan <92274156+karpetrosyan@users.noreply.github.com>

hishel/_utils.py

@@ -49,7 +49,7 @@ def generate_key(request: httpcore.Request, body: bytes = b"") -> str:
 
     key_parts = [request.method, encoded_url, body]
 
-    key = blake2b(digest_size=16)
+    key = blake2b(digest_size=16, usedforsecurity=False)
     for part in key_parts:
         key.update(part)
     return key.hexdigest()