Lint if workspace dependency inheritance isn't used

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What it does

If a package has a dependencies entry that specifies a source besides workspace = true, it fires

See also rust-lang/rust-clippy#10306

Advantage

For projects that want to be consistent on their dependencies across a workspace

Drawbacks

• #12162
• Packages cannot have different version requirements (#15526)

Example

[dependencies]
serde = "1"

Could be written as:

[workspace.dependencies]
serde = "1"

[dependencies]
serde.workspace = true

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Alternatively, cargo-deny focuses on de-duplication, see https://embarkstudios.github.io/cargo-deny/checks/bans/diags.html#workspace-duplicate

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We should consider the impact on #4242

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Redundant with #13723