Reference no update command in uv sync version mismatch

[maxmynter]

Closes: #13253

Summary

(Very) small change to refer to update command uv self update when the uv version is mismatched.

I found only this one occurrence where a reference is suitable. Only other contenders are here

uv/crates/uv/src/commands/project/mod.rs

Lines 81 to 85 in 21b9f62

	#[error("The lockfile at `uv.lock` uses an unsupported schema version (v{1}, but only v{0} is supported). Downgrade to a compatible uv version, or remove the `uv.lock` prior to running `uv lock` or `uv sync`.")]
	UnsupportedLockVersion(u32, u32),
	#[error("Failed to parse `uv.lock`, which uses an unsupported schema version (v{1}, but only v{0} is supported). Downgrade to a compatible uv version, or remove the `uv.lock` prior to running `uv lock` or `uv sync`.")]
	UnparsableLockVersion(u32, u32, #[source] toml::de::Error),

But I think this would rather convolute the message and they will run into the other message when running uv sync.

Note

Happy to also try my look with implementing your feedback on #11869 if that's ok for you, @aarondobbing?

Test Plan

Local test

[maxmynter]

I don't think that the CI failures are related to this change. Locally, I get them on main (041c7a5) too.

[konstin]

Fixed the CI error in #13259

[charliermarsh]

Unfortunately this also got PR'd in #13305, so sorry for the overlap!