Update dependency multidict to v6.6.4

Author: renovate[bot]

app/requirements.txt

@@ -6,7 +6,7 @@ charset-normalizer==3.1.0
 py-cord==2.4.1
 frozenlist==1.3.3
 idna==3.4
-multidict==6.0.4
+multidict==6.6.4
 toml==0.10.2
 yarl==1.9.2
 pandas==2.0.2