chore(deps): upgrade to pinecone v2 vectorstores

[golangisfun123]

PR Checklist

I noticed in my personal project when I would use Pinecone v2 Go SDK along with LangchainGo Pinecone Vectorstores, we got some collision from protobuff, so upgrading to use Pinecone V2 in Langchain

go run ./main.go                                                                                                ✔  system   at 04:17:04 PM
panic: proto: file "db_data_2024-10.proto" has a name conflict over DescribeIndexStatsResponse
                previously from: "github.com/pinecone-io/go-pinecone/internal/gen/data"
                currently from:  "github.com/pinecone-io/go-pinecone/v2/internal/gen/db_data/grpc"
        See https://protobuf.dev/reference/go/faq#namespace-conflict

So this should fix.

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