User's avatar in `!user` is not animated.
## Problem
Right now, when doing `!user` the avatar is always set to `png`, even if the user's avatar is a gif.

## Proposal
Similar to how we are handling avatars in other places, instead of using the `format` keyword, we can use the `static_format` keyword instead, as [documented in discord.py](https://discordpy.readthedocs.io/en/latest/api.html#discord.User.avatar_url_as)

The code responsible for the command can be found here:
https://github.com/python-discord/bot/blob/fe325adc66e9621ea970abd83db58df4b792caa5/bot/cogs/information.py#L209-L212

You can see how filter is formating it here:
https://github.com/python-discord/bot/blob/fe325adc66e9621ea970abd83db58df4b792caa5/bot/cogs/filtering.py#L233-L243
diff --git a/bot/cogs/information.py b/bot/cogs/information.py
index 4eb36c34..ef2f308c 100644
--- a/bot/cogs/information.py
+++ b/bot/cogs/information.py
@@ -206,7 +206,7 @@ class Information(Cog):
             description="\\n\\n".join(description)
         )
 
-        embed.set_thumbnail(url=user.avatar_url_as(format="png"))
+        embed.set_thumbnail(url=user.avatar_url_as(static_format="png"))
         embed.colour = user.top_role.colour if roles else Colour.blurple()
 
         return embed
diff --git a/tests/bot/cogs/test_information.py b/tests/bot/cogs/test_information.py
index 6dace108..b5f928dd 100644
--- a/tests/bot/cogs/test_information.py
+++ b/tests/bot/cogs/test_information.py
@@ -485,7 +485,7 @@ class UserEmbedTests(unittest.TestCase):
         user.avatar_url_as.return_value = "avatar url"
         embed = asyncio.run(self.cog.create_user_embed(ctx, user))
 
-        user.avatar_url_as.assert_called_once_with(format="png")
+        user.avatar_url_as.assert_called_once_with(static_format="png")
         self.assertEqual(embed.thumbnail.url, "avatar url")
 
 
['bot/cogs/information.py', 'tests/bot/cogs/test_information.py']