fix stack overflow in when accidentally following non-workspace deps that shadow workspace dep names

[jkelleyrtp]

I had an issue when publishing the dioxus repo.

We're shadowing our own crate for backwards compatibility, but cargo-workspaces chokes on this and ends up self-recursing into a stack overflow.

This fixes that by only inserting dag members that have a path on the filesystem (are not published crates)

[package]
name = "const-serialize"
version = "0.8.0-alpha.0"
authors = ["Evan Almloff"]
edition = "2021"
description = "A serialization framework that works in const contexts"
license = "MIT OR Apache-2.0"
repository = "https://github.com/dioxuslabs/dioxus"
homepage = "https://dioxuslabs.com/learn/0.5/getting_started"
keywords = ["const", "serialize"]
rust-version = "1.83.0"

[dependencies]
const-serialize-macro = { workspace = true }
serde = { workspace = true, features = ["derive"], optional = true }
const-serialize-07 = { package = "const-serialize", version = "=0.7.2", optional = true }

[pksunkara]

Really appreciate the PR. Since I had recently updated the MSRV, I want to do a little bit more work before next release. Please let me know if you need a quick release though and I can backport this change.