build: bump azure-functions from 1.20.0 to 1.21.0 (#1366)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

poetry.lock

@@ -10,7 +10,7 @@ packages = [
 
 [tool.poetry.dependencies]
 python = "^3.10"
-azure-functions = "1.20.0"
+azure-functions = "1.21.0"
 streamlit = "1.38.0"
 python-dotenv = "1.0.1"
 azure-ai-formrecognizer = "3.3.3"