chore: switch from pydantic.v1 to pydantic

semantic_router/encoders/aurelio.py

semantic_router/encoders/clip.py

semantic_router/encoders/cohere.py

semantic_router/encoders/fastembed.py

semantic_router/encoders/huggingface.py

semantic_router/encoders/mistral.py

semantic_router/encoders/openai.py

semantic_router/index/base.py

semantic_router/index/pinecone.py

semantic_router/index/qdrant.py

semantic_router/llms/base.py

semantic_router/llms/cohere.py

semantic_router/llms/llamacpp.py

semantic_router/llms/mistral.py

semantic_router/route.py

semantic_router/routers/base.py

semantic_router/routers/hybrid.py

semantic_router/schema.py

semantic_router/utils/function_call.py

tests/unit/test_schema.py