CCM-17044: Trim mesh-download dependencies

Author: gareth-allan

lambdas/mesh-download/requirements.txt

@@ -1,14 +1,4 @@
-certifi>=2023.07.22
-mesh-client>=3.2.3
-structlog>=21.5.0
-orjson>=3.9.15
 pydantic>=2.0.0
-boto3>=1.28.62
-urllib3>=1.26.19,<2.0.0
-idna>=3.7
-requests>=2.32.0
-pyopenssl>=24.2.1
 nhs-notify-digital-letters-onboarding @ git+https://github.com/NHSDigital/nhs-notify-digital-letters-onboarding@0.1.0
 -e ../../src/digital-letters-events
--e ../../utils/py-mock-mesh
 -e ../../utils/py-utils