fix: lint fixes

semantic_router/encoders/aurelio.py

semantic_router/encoders/base.py

semantic_router/encoders/bedrock.py

semantic_router/encoders/clip.py

semantic_router/encoders/cohere.py

semantic_router/encoders/fastembed.py

semantic_router/encoders/huggingface.py

semantic_router/encoders/openai.py

semantic_router/encoders/vit.py

semantic_router/encoders/zure.py

semantic_router/index/postgres.py

semantic_router/llms/base.py

semantic_router/llms/cohere.py

semantic_router/llms/llamacpp.py

semantic_router/llms/mistral.py

semantic_router/llms/ollama.py

semantic_router/llms/openai.py

semantic_router/llms/openrouter.py

semantic_router/llms/zure.py

semantic_router/route.py